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Prob/Stats - Final Exam Review - In Class

Total questions: 136

Worksheet time: 5hrs 32mins

Name
Class
Date
1.
Mrs. Trahan samples her class by selecting every third person on her class list.  Which type of sampling method is this?
a)
Simple
b)
Systematic
c)
Stratified
d)
Cluster
2.
Mrs. Trahan samples her class by selecting all students sitting at group 1 and group 5 in her classroom.  This sampling technique is called?
a)
Simple
b)
Stratified
c)
Systematic
d)
Cluster
3.
Mrs. Trahan samples her class by picking 10 numbers from her hat and each number is assigned to a student. This is ______________ random sampling.
a)
Systematic
b)
Simple
c)
Stratified
d)
Cluster
4.
Farmer Joe separates his apple tree farm into 10 regions.  He counts the number of apples produced in just one of the regions and uses that estimate to predict the number of apples produced on the whole farm.  This is _______ sampling.
a)
Simple
b)
Cluster
c)
Stratified
d)
Systematic
5.
Farmer Joe's apple tree farm is set up in 100 rows.  He counts the number of apples produced on every 10th row to estimate the number apples produced on the whole farm.  This is _____________ sampling.  
a)
Simple
b)
Stratified
c)
Cluster
d)
Systematic
6.
Farmer Joe randomly picks 100 trees using a random number generator to estimate the number of apples produced by his apple trees.  This is ______________ sampling.
a)
Simple
b)
Stratified
c)
Cluster
d)
Systematic
7.
In order to use samples to estimate something from the population, the sample should be _________________ the population.
a)
exactly the same as
b)
nothing like
c)
representative of
d)
larger than
8.
True or False: all samples lead to a good prediction about an entire population.
a)
True
b)
False
9.
Mrs. Boyd wants to find the average height of all her students in her classes. She decides to use the first 5 people who walk in the door. Is this a good representative sample?
a)
Yes
b)
No
10.
What type of sampling?  A journalist asks his family how they feel about water pollution.
a)
Random sample
b)
Convenience sample
c)
Stratified Random sample
d)
Census
11.
This sample consists of units of the population that chose to respond.
a)
mandatory
b)
census
c)
volunteer
d)
unbiased
12.

Identify the population and sample.

A survey of 1535 American households found that 18% of households do not own a computer.

a)

Population: 1535 American households

Sample: 18% of households

b)

Population: All American households

Sample: 1535 American households

c)

Population: All American households

Sample: 18% of households

d)

Population: 1535 American households

Sample: 276 households

13.

Identify the population and the sample.

A recent survey of 2625 elementary school children found that 28% of the children could be classified as obese.

a)

Population: All elementary school children

Sample: 2625 elementary school children surveyed

b)

Population: All elementary school children

Sample: 28% of the children

c)

Population: 2625 elementary school children

Sample: 28% of the children

d)

Population: 2625 elementary school children

Sample: 735 elementary school children

14.

Researchers were interested to know whether internal vehicle temperatures vary by outside temperatures. To evaluate this, temperature rise was measured continuously over a 60-minute period in a dark SUV on 16 different clear, sunny days with outside temperatures ranging from 72oF to 96oF. The researchers' method of analysis is best described as:

a)

a census.

b)

a survey.

c)

an observational study.

d)

a randomized comparative experiment.

e)

a single-blind randomized comparative experiment.

15.
Runners after an ultramarathon commonly develop respiratory infections. We want to know if taking 600 milligrams of vitamin C daily will reduce these infections. Researchers randomly assigned 100 ultramarathon runners to receive either vitamin C or placebo. All subjects were watched for 14 days after the big race to see if infections developed. The type of design used here?
a)
matched pairs
b)
randomized block
c)
completely randomized
d)
stratified 
16.
A market research company wishes to find out whether the population of students at a university prefers Starbucks or Dunkin Donuts. A random sample of students is selected, and each student is asked first to try both but the order they try them is randomly decided with a coin toss (heads: Starbucks, then Dunkin. tails: vice versa). They then indicate which brand they prefer. This is an example of
a)
a completely randomized experiment
b)
an observational study
c)
a stratified sample
d)
a matched pairs experiment
17.
True or False: An example of a matched pair experimental design is having one twin receive treatment A and the second twin receive treatment B
a)
True
b)
False
18.
In order to perform an experiment using 60 members of a gym, I first divide the list of members into men and women because I feel that the results will be different based on gender. I then randomly choose 30 men and 30 women. I assign half of the men to the treatment group and half to the control group. I repeat this procedure with the women. This is an example of a:
a)
randomized comparative design
b)
blocking design
c)
matched pairs design
d)
double blind simple random sample
19.

In the previous problem, supposed that the researchers suspected that women over the age of 55 may respond differently to the treatment. Given that a random sample of 40,000 women over the age of 45 has already been chosen, the study would have been improved by:

a)

a stratified sample, with strata determined by age.

b)

a stratified sample, with strata determined by gender.

c)

a block design, with blocks determined by age.

d)

a block design, with blocks determined by gender.

e)

a double-blind completely randomized design.

20.

An in-person survey in which respondents were asked if they voted in the most recent election is likely to suffer from (a)   bias if the respondents feel embarrassed about no voting.

21.

During a school project, Jackson, Abigail, and Aiden conducted a census of the students in their school. Which term is used to describe the summary values they obtained from this census?

a)

Statistics

b)

Parameters

c)

Means

d)

Centers

e)

None of the above

22.
Source of bias that occurs when an individual chosen for the sample CAN'T be contacted or refuses to cooperate.
a)
Response Bias
b)
Undercoverage
c)
Nonresponse
d)
Voluntary Response
23.
What's your favorite subject in school?
a)
Categorical
b)
Quantitative
24.
Where do you plan on attending college?
a)
Categorical
b)
Quantitative
25.
How many states have you visited in your lifetime?
a)
Categorical
b)
Quantitative
26.

Is the information collected during the survey quantitative or categorical data?

a)

Quantitative data. I know this because the y-axis is labeled with numbers. 

b)

Quantitative data. I know this because the surveyor counted how many people that they surveyed. 

c)
Categorical data. I know this because the responses to the survey are names. 
d)
Categorical data. I know this because each column is a different color. 
27.

If your teacher asked you to make categorical observations about the class’s pet hamster, which group of words might be used?

a)

A mass of 3 kg, 11 cm long, age of 16 months

b)

A mass of 3 kg, 11 cm long, cute

c)

A long hair, white and brown colored, soft

d)

A temperature, length, weight

28.

Which sport represents the mode?

a)

Soccer

b)

Softball

c)

Football

d)

Basketball

29.

What is the total number of students speaking different languages?

(a)  

30.
What is the relative frequency of students speaking Spanish?
a)
16%
b)
12%
c)
24%
d)
48%
31.

The table shows the results of a survey about favorite types of stores. Determine the relative frequency for each store.

a)

clothing: 38%

electronics: 22%

pet: 10%

candy: 30%

b)

clothing: 19%

electronics: 11%

pet: 5%

candy: 15%

c)

clothing: 50%

electronics: 25%

pet: 5%

candy: 20%

d)

clothing: 35%

electronics: 23%

pet: 15%

candy: 27%

32.
What is the relative frequency (to the nearest percent) of boys among those who cannot bike to school? 
a)
4%
b)
14%
c)
13%
d)
29%
33.
What percentage of SUV's are driven by women?
a)
56.25%
b)
75%
c)
83.25%
d)
86.5%
34.
What percentage of girls have blonde hair?
a)
30%
b)
32%
c)
29%
d)
40%
35.

What is the shape of the data?

a)

symmetrical

b)

skewed left

c)

skewed right

d)

bell curve

36.

What is shape of the data?

a)

symmetrical

b)

skewed left

c)

skewed right

d)

bell curve

37.

What is the shape of the data?

a)

symmetrical

b)

skewed left

c)

skewed right

d)

bell curve

38.

Which statement best describes this graph?

a)

The graph is symmetrical.

b)

There is a cluster of data between 23 and 25.

c)

The spread is 10.

d)

The most students sold 25 magazines.

39.

Which statement best describes the graph?

a)

The data is skewed left.

b)

The data is symmetrical.

c)

There is a peak between 10 and 14 hours.

d)

There is a cluster between 5 and 9

40.

What measure of center (mean, median ) would be best for the following set of data?

0, 89, 92, 97, 99, 100

a)

Median, because it is the one that shows up the most.

b)

Median, because there is an outlier.

c)

Mean, because there is not an outlier.

d)

There is not a best measure of center for this data.

41.

Find the median of the data set

(a)  

42.

Which dot plot has the greatest variability (spread)?

a)
A
b)
B
c)
C
d)
D
43.

The data set below has an outlier of 42.
2, 5, 12, 15, 19, 4, 6, 11, 16, 18, 12, 12, 42
What effect does the outlier have on the distribution of the data?

a)
The mean will decrease
b)
The median will decrease
c)
The mean will increase
d)
The median will increase
44.

Find the median of this set of numbers:
10, 10, 7, 12, 11

(a)  

45.

How many veterans had more than 15 years of service?

(a)  

46.
Which of the following lists all parts of the five number summary?
a)
Mean, Median, Mode, Range, and Total
b)
Minimum, Quartile 1, Median, Quartile 3, and Maximum 
c)
Smallest, Q1, Q2, Q3, and Q4
d)
Minimum, Maximum, Range, Mean, and Median
47.
What is the term for the median of the lower half of the data?
a)
Lower Quartile
b)
Upper Quartile
c)
Median
d)
Maximum
48.

What is the IQR of this data set?

9, 5, 6, 3, 1, 8

(a)  

49.

Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is Roger's median score?

(a)  

50.
You must find the 5 number summary in order to make a box and whisker plot. 
a)
True
b)
False
51.

What is the IQR of the Cruisers?

(a)  

52.
In order to find the median, the data must be sorted from least to greatest first.
a)
A. True
b)
B. False
53.

What is the median (Q2) of the data set:

3, 5, 2, 1, 4, 5, 8

(a)  

54.

What is the Q1 (median of lower half) of the data set: 3,5,2,1,4,5,8

(a)  

55.

What is the difference in the IQRs?

(a)  

56.
What percentage of the data is between 90 and 140?
a)
25 %
b)
50%
c)
75%
d)
100%
57.

What percentage of students scored a 39 or higher?

a)

None

b)

25%

c)

50%

d)

75%

58.

The middle 50% of scores were between....

a)

30-39

b)

30-50

c)

39-55

d)

50-68

59.

Which group has a higher median reaction time?

a)

Group A

b)

Group B

c)

They're the same

60.
The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 5.6 seconds?
a)
-1.33
b)
1.33
c)
0.88
d)
1.02
61.

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5. What is the probability that in a week there would be fewer (less) than 5 accidents?

a)

0.6915

b)

0.1762

c)

0.8238

d)

-0.93

62.
The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?
a)
68%
b)
34%
c)
16%
d)
2.5%
63.

On the math portion of the SAT, scores are roughly normal, with a mean of 500 and a standard deviation of 100. What percent of scores are above 400?

a)

68%

b)

81.5%

c)

84%

d)

99.7%

64.

On the math portion of the SAT the scores are roughly normal with a mean of 500 and a standard deviation of 100. Between what two values do approximately 95% of scores lie?

a)

500-600

b)

200-800

c)

300-700

d)

500-800

65.
The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 5.6 seconds?
a)
-1.33
b)
1.33
c)
0.88
d)
1.02
66.

The mean baking time of an angel food cake is 41 minutes with a standard deviation of 5 minutes (normally distributed). What percent of angel food cakes take less than half an hour to bake?

a)

98.61%

b)

2.2%

c)

1.39%

d)

97.8%

67.

Following a normal distribution the mean wingspan of a hummingbird is 3.5 mm with a standard deviation of 0.76 mm. What percentage of hummingbirds have wingspans between 3.4 and 4.1 mm?

a)

33.7%

b)

43.72%

c)

40.1%

d)

67.5%

68.
The scoring of modern IQ is such that Intelligence Quotients (IQs) have a normal distribution of μ= 100 and 𝞂 = 15.

Mensa International is a non-profit organization that accepts only people with IQ score within the top 2%. What level of IQ qualifies one to be a member of Mensa?
a)

115

b)

130.75

c)

145

d)

120.5

69.

At a college the scores on the chemistry final exam are approximately normally distributed, with a mean of 75 and a standard deviation of 12. The scores on the calculus final are also approximately normally distributed, with a mean of 80 and a standard deviation of 8. A student scored 81 on the chemistry final and 84 on the calculus final. Relative to the students in each respective class, in which subject did this student do better?

a)

The student did better in chemistry.

b)

The student did better in calculus.

c)

The student did equally well in each course

d)

There is no basis for comparison, since the subjects are different from each other .

e)

There is not enough information for comparison, because the number of students is not known.

70.

The weight of adult male grizzly bears living in the continental US is approximately normally distributed with a mean of 500 pounds and a standard deviation of 50 pounds. The weight of adult female grizzly bears is approximately normally distributed with a mean of 300 pounds and a standard deviation of 40 pounds. Approximately, what would be the weight of a female grizzly bear with the same standardized score (z-score) as a male grizzly bear with a weight of 530 pounds?

a)

276 pounds

b)

324 pounds

c)

330 pounds

d)

342 pounds

e)

533 pounds

71.

For a recent season in college football, the total number of rushing yards for that season is recorded for each running back. The mean number of rushing yards for the running backs that season is 790 yards. One running back had 1,637 rushing yards for the season, which is 2.42 standard deviations above the mean number of rushing yards. What is the standard deviation of the number of rushing yards for the running backs that season?

a)

250 yards

b)

300 yards

c)

350 yards

d)

400 yards

e)

450 yards

72.

A researcher is studying a group of field mice. The distribution of the weight of field mice is approximately normal with mean 25 grams and standard deviation 4 grams. Which of the following is closest to the proportion of field mice with a weight greater than 33 grams?

a)

0.023

b)

0.046

c)

0.954

d)

0.977

e)

1.000

73.
What does this symbol represent?
a)

Mean of sample proportions

b)
standard deviation of the sample proportions
c)
standard deviation of the population
74.

A statistic is an unbiased estimator of a parameter when

a)

in many samples, the values of the statistic are centered at the parameter

b)

the statistic is calculated from a random sample.

c)

in a single sample, the value of the statistic is equal to the parameter

75.
At a particular college, 78% of all students are receiving some kind of financial aid.The school newspaper selects a random sample of 100 students and 72% of the respondents say they are receiving some sort of financial aid. Which of the following is true?
a)
 78% is a population and 72% is a sample.
b)
72% is a population and 78% is a sample
c)
78% is a parameter and 72% is a statistic
d)
72% is a parameter and 78% is a statistic
76.

The Gallup Poll asked a random sample of 1785 adults whether they attended church during the past week.  Let p-hat be the proportion of people in the sample who attended church.  A newspaper report claims that 40% of all U.S. adults went to church last week.  Suppose this claim is true. 
What is the mean of the sampling distribution?

a)
0.4
b)
0.44
c)
0.56
d)
0.6
77.
28% of all Woodrow students believe Monday will be snow day. You take a sample of 50 students and find that 15 of them believe Monday will be a snow day. What does 50 represent? 
a)

n

sample size

b)

P

population %

c)

μ\mu

population avg.

d)

σ\sigma

standard deviation

78.

28% of all Woodrow students believe Monday will be snow day. You take a sample of 50 students and find that 15 of them believe Monday will be a snow day. What does 28% represent? 

a)

n

sample size

b)

P

population %

c)

μ\mu

population avg.

d)

σ\sigma

standard deviation

79.

What happens to the shape of a sampling distribution as n(sample size) increases?

a)

It becomes wider

b)

It becomes more narrow

c)

It becomes skewed

80.

64% of all RCHS students believe sunglasses can be worn in class. You take a sample of 56 students and find that 35 of them believe sunglasses can be worn in class. What does 56 represent? 

a)

n

b)

P

c)

μ\mu

d)

σ\sigma

81.

The Gallup Poll asked a random sample of 240 adults if they had a speeding violation.  96 said they did. Let p-hat be the proportion of people in the sample who had speeding tickets.  The local police department reports that 42% of the citizens had speeding tickets.  Suppose this claim is true.  What is the mean of the sampling distribution?

a)

0.4

b)

0.42

c)

0.58

d)

0.6

82.

What happens to the shape of a sampling distribution as n (sample size) decreases?

a)

It becomes narrower

b)

It becomes skewed. 

c)

It becomes wider

83.
What does this symbol represent?
a)
population proportion
b)

mean of sample proportion

c)
sample proportion
d)

standard deviation

84.
If you had to choose a "best statistic" to describe a population, which of the following would be best.
a)
low bias, high variability
b)
high bias, high variability
c)
low bias, low variability
d)
high bias, low variability
85.

Explain the Central Limit Theorem and its significance in statistics.

a)

The Central Limit Theorem states that the sampling distribution of the sample mean will be approximately exponentially distributed, regardless of the shape of the population distribution. It is significant in statistics because it allows us to make inferences about the population standard deviation using the sample standard deviation.

b)

The Central Limit Theorem states that the sampling distribution of the sample mean will be approximately skewed distributed, regardless of the shape of the population distribution. It is significant in statistics because it allows us to make inferences about the population mode using the sample mode.

c)

The Central Limit Theorem states that the sampling distribution of the sample mean will be approximately normally distributed, regardless of the shape of the population distribution. It is significant in statistics because it allows us to make inferences about the population mean using the sample mean.

d)

The Central Limit Theorem states that the sampling distribution of the sample mean will be approximately uniformly distributed, regardless of the shape of the population distribution. It is significant in statistics because it allows us to make inferences about the population median using the sample median.

86.

What is a sampling distribution and how is it different from a population distribution?

a)

A sampling distribution is the distribution of a sample mean, whereas a population distribution is the distribution of a sample range.

b)

A sampling distribution is the distribution of a sample statistic, such as the mean or standard deviation, whereas a population distribution is the distribution of the entire population.

c)

A sampling distribution is the distribution of a population, whereas a population distribution is the distribution of a sample.

d)

A sampling distribution is the distribution of a sample size, whereas a population distribution is the distribution of a population size.

87.

If the population mean is 50 and the standard deviation is 10, what is the mean of the sampling distribution if the sample size is 100?

a)

75

b)

25

c)

50

d)

100

88.

Explain the concept of the mean of a sampling distribution and its relationship to the population mean.

a)

The mean of a sampling distribution is an estimate of the population mean.

b)

The mean of a sampling distribution has no relationship to the population mean.

c)

The mean of a sampling distribution is not an estimate of the population mean.

d)

The mean of a sampling distribution is always higher than the population mean.

89.

If a population is normally distributed with a mean of 60 and a standard deviation of 5, what can we say about the shape of the sampling distribution of the sample mean for a sample size of 30?

a)

Uniformly distributed

b)

Negatively skewed

c)

Positively skewed

d)

Normally distributed

90.

The Gallup Poll asked a random sample of 1785 adults whether they attended church during the past week. Let p-hat be the proportion of people in the sample who attended church. A newspaper report claims that 40% of all U.S. adults went to church last week. Suppose this claim is true.

What is the mean of the sampling distribution of p-hat?

a)

0.40

b)

0.44

c)

0.56

d)

0.60

91.
The mean and standard deviation of a population are 200 and 20, respectively. Sample size is 25. 
What is the standard deviation of the sampling distribution?
a)
200
b)
16
c)
25
d)
4
92.
The mean weight of potato chip bags is 10.5 ounces with a standard deviation of 3 ounces. A random sample of 40 bags of potato chips is selected. What is the probability that the mean of the sample is less than 10 ounces?
a)
P = -1.05
b)
P = .1469
c)
P = .0202
d)
P = .8531
93.
If you are to find P (x̄ ≥ 10) that means
a)
the probability that the sample mean is less than 10
b)
the probability that the sample mean is no more than 10
c)
the probability that the sample mean is at least 10
d)
the probability that the sample mean is more than 10
94.
What is the probability of spinning green?
a)
0
b)
1/4
c)
1/2
d)
3/4
95.

There are 20 marbles in the jar.

What is the probability of choosing a marble that is NOT green from the jar?


CHECK ALL THAT APPLY

a)

10/20

b)

5%

c)

10%

d)

0.5

96.

In a survey, 100 middle school students were asked which social media platform they preferred. The results are shown in the table above.


What is the probability that a student prefers TikTok?

CHECK ALL THAT APPLY

a)

72 out of 100

b)

72%

c)

0.72

d)

72/100

97.
Twenty-five people were asked which of the four gifts was their favorite.  Which gift was favored 16% of the time?
a)
Flowers
b)
Perfume
c)
Jewelry
d)
Clothing
98.

A regular 6-sided die is to be rolled once. What is the probability that a number less than 3 is rolled?

a)

1/3

b)

1/6

c)

1/2

d)

2/3

99.
There are 16 boys and 12 girls in class. If one student is selected at random from the class, what is the probability it is a girl?
a)
1/2
b)
1/28
c)
3/7
d)
16/28
100.
You have a cube with each face numbered 1, 2, 3, 4, 5, or 6. What is the probability if you roll the cube 4 times, you will get the number 3 each time? 
a)
4/1296
b)
4/5
c)
1/256
d)
1/1296
101.
Ricardo has the spinner pictured here and a bag of marbles filled with 2 red marbles, 3 green marbles, and 3 blue marbles. What is the probability that Ricardo spins red on the spinner and picks a red marble out of the bag?
a)
1 ⁄ 16
b)
1 ⁄ 2
c)
1 ⁄ 4
d)
1 ⁄ 8
102.
What is the probability of rolling a dice and landing on a 4, and then rolling the dice again and landing on any even number?
a)
1 ⁄ 6
b)
1 ⁄ 8
c)
1 ⁄ 2
d)
1 ⁄ 12
103.
Is the event INDEPENDENT or DEPENDENT?
You have a jar with 24 pieces of chocolate candy and 14 pieces of orange candy.  We take one piece of candy at random from the jar, put it back, and then take a second piece of candy at random from the jar.
a)
Independent
b)
Dependent
104.

Is the event INDEPENDENT or DEPENDENT?

Amy plays card games. She picks a card at random. Then without putting the first card back, she picks a second card at random.

a)

Independent

b)

Dependent

105.

If A = {1, 3, 5, 7, 9} and B = {2, 3, 5, 7}, what is A ∩ B?

a)

{3, 5, 7}

b)

{2, 3, 5, 7}

c)

{2, 3, 5, 7, 9}

d)

{1, 2, 3, 5, 7, 9}

106.
How many students do not ski or ice skate?
a)
10
b)
16
c)
22
d)
28
107.
From the above Venn diagram, what is the set S ∩ T?
a)
{casey, drew, jade, glen}
b)
{alex, casey, drew,hunter}
c)
{casey, drew}
d)
{drew, jade}
108.
How many senior boys play football but do not wrestle?
a)
9
b)
12
c)
18
d)
104
109.
Probability can be written as ...
a)
a fraction
b)
a decimal
c)
a percent
d)
all of the above
110.

If A = {1, 3, 5, 7, 9} and B = {2, 3, 5, 7}, what is A ∪ B?

a)

{3, 5, 7}

b)

{2, 3, 5, 7}

c)

{2, 3, 5, 7, 9}

d)

{1, 2, 3, 5, 7, 9}

111.

What does this symbol ( ∪ ) represent in set theory?

a)

Union

b)

Intersection

c)

Disjointed

d)

Subset

112.
What does this symbol ( ∩ ) represent in set theory?
a)
Union
b)
Intersection
c)
Disjointed
d)
Subset
113.
What statement does the shaded region represent
a)
A or B
b)
Not A
c)
A and B
d)
Not B
114.
What statement does the shaded region represent?
a)
A or B
b)
A and B
c)
A
d)
B
115.
Which of the following represents the shaded region?
a)
(A ⋃ B)'
b)
(A ∩ B)'
c)
A'
d)
B'
116.
a)
.2855
b)
.6246
c)
.0922
d)
.3230
117.
Mary is a good student. The probability that she studies and passes her test is 3/5. If the probability that she studies is 8/9. What is the probability that she passes given that she studies? 
a)
27/40
b)
1.48
c)
.008
d)
.0593
118.
What is the probability that a student does play a sport given they do not play an instrument? 
a)
.2
b)
.2222
c)
.10
d)
.5
119.
P(Pizza|Senior):
a)
10/15
b)
4/5
c)
2/3
d)
10/5
120.

Consider the following table with information about all of the students taking Statistics at Happy High School.


P( Male | Full-time)

a)

28/71

b)

3/7

c)

12/71

d)

3/10

121.
P(Sandals|Pants):
a)
4/20
b)
6/15
c)
1/2
d)
2/7
122.

What is the probability the dessert has peanut butter in it?

a)

0.84

b)

0.58

c)

0.22

d)

0.59

123.

What is the chance that the dessert is brownies and has peanut butter in it?

a)

0.94

b)

0.58

c)

0.99

d)

0.95

124.

What is the chance that the dessert is not brownies and does not have peanut butter in it?

a)

0.58

b)

0.42

c)

0.06

d)

0.05

125.

What is the probability that the dessert is brownies or does have peanut butter in it?

a)

0.95

b)

0.99

c)

0.42

d)

0.64

126.

Knowing that the dessert has peanut butter in it, what is the probability that it's brownies?

a)

1.58

b)

0.58

c)

0.02

d)

0.98

127.

P (brownies  l  no peanut butter)

a)

0.12

b)

0.88

c)

0.05

d)

0.58

128.
What is a line of best fit used for?
a)
To make predictions
b)
To make the graph look pretty
c)
To connect the points
129.
As study time _______________, errors _______________.
a)
increases ; decrease
b)
increases ; increase
c)
decreases; decrease
d)
increases ; stays the same
130.

The results of a linear regression are shown.

Which phrase best describes the relationship between x and y?

a)

strong negative correlation

b)

strong positive correlation

c)

weak negative correlation

d)

weak positive correlation

131.
Residuals are . . . 
a)
possible models not explored by the researcher
b)
variation in the response variable that is explained by the model
c)
the difference between the observed response and the values predicted by the model
d)
data collected from individuals that is not consistent with the rest of the group
132.

If the line of regression is y = 3.45x - 6.7 and the actual point is (5,12), what is the residual for that point?

a)

1.45

b)

-1.45

c)

34.7

d)

-34.7

133.
What should a residual plot look like?
a)
Distinct Pattern
b)
Curve
c)
Random
134.
A restaurant sells pizza for the prices in the data table.  Calculate the linear regression equation of the data.
a)
y = 1.5x + 12
b)
y = 12x + 1.5
c)
y = 0.67x - 8
d)
y = -8x + 0.67
135.
Data was collected on the weight of a male  laboratory rat for the first 25 weeks after its birth. The linear regression equation is 
y= 40x+100, where x is number of weeks and y is weight in grams. 
What does the y-intercept mean in context of the problem?
a)
The predicted weight of the rat in year 0. 
b)
The predicted weight of the rat at birth. 
c)
The current weight of the rat. 
d)
The average increase in the rat's weight. 
136.

The correlation coefficient, r is used to determine

a)

y values given values of x.

b)

x values given values of y.

c)

the strength and direction of relationship between x and y.

d)

none of these.

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