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Statistics Review A: Descrip Stat, Test Design, Lin Reg

Total questions: 95

Worksheet time: 3hrs 10mins

Name
Class
Date
1.

A (a)   is a collection of persons, things, or

objects under study

2.

A (a)   is collected to study a population.

3.

(a)   is done to the larger population to study that portion (the sample) to gain information about the population.

4.

A (a)   is a number that represents a property of the sample.

5.

A (a)   is a numerical characteristic of the whole population that can be estimated by a

statistic.

6.

The sample must contain the characteristics of the population in order to be a (a)   sample.

7.

A (a)   , usually notated by capital letters such as X and Y, is a characteristic or measurement that can be determined for each member of a population.

8.

(a)   variables take on values with equal units such as weight in pounds and time in hours.

9.

(a)   variables place the person or thing into a category.

10.

(a)   are the actual values of the variable. They may be numbers or they may be words.

11.

(a)   is a single value of a variable.

12.

If you were to take three exams in your math classes

, you would calculate your (a)   score by adding the three exam scores and dividing by three.

13.

If, in your math class, there are 40 students and 22 are men

, then the (a)   of men students is 22/40 .

14.

A study was conducted at a local college to analyze the average cumulative GPA’s of students who graduated last

year. Fill in the letter of the phrase that best describes each of the items below. The population is ...

a)

all students who attended the college last year

b)

the cumulative GPA of one student who graduated from the college last year

c)

all students who graduated from the college last year

d)

a group of students who graduated from the college last year, randomly selected

e)

the average cumulative GPA of students who graduated from the college last year

15.

A study was conducted at a local college to analyze the average cumulative GPA’s of students who graduated last

year. Fill in the letter of the phrase that best describes each of the items below. The statistic is ...

a)

all students who attended the college last year

b)

the cumulative GPA of one student who graduated from the college last year

c)

the average cumulative GPA of students in the study who graduated from the college last year.

d)

a group of students who graduated from the college last year, randomly selected

e)

the average cumulative GPA of students who graduated from the college last year

16.

A study was conducted at a local college to analyze the average cumulative GPA’s of students who graduated last

year. Fill in the letter of the phrase that best describes each of the items below. The parameter is ...

a)

all students who attended the college last year

b)

the cumulative GPA of one student who graduated from the college last year

c)

all students who graduated from the college last year

d)

a group of students who graduated from the college last year, randomly selected

e)

the average cumulative GPA of students who graduated from the college last year

17.

A study was conducted at a local college to analyze the average cumulative GPA’s of students who graduated last

year. Fill in the letter of the phrase that best describes each of the items below. A sample is ...

a)

all students who attended the college last year

b)

the cumulative GPA of one student who graduated from the college last year

c)

all students who graduated from the college last year

d)

a group of students who graduated from the college last year, randomly selected

e)

the average cumulative GPA of students who graduated from the college last year

18.

A study was conducted at a local college to analyze the average cumulative GPA’s of students who graduated last

year. Fill in the letter of the phrase that best describes each of the items below. The variable is ...

a)

all students who attended the college last year

b)

the cumulative GPA of one student who graduated from the college last year

c)

all students who graduated from the college last year

d)

a group of students who graduated from the college last year, randomly selected

e)

the average cumulative GPA of students who graduated from the college last year

19.

A study was conducted at a local college to analyze the average cumulative GPA’s of students who graduated last

year. Fill in the letter of the phrase that best describes each of the items below. The variable is ...

a)

all students who attended the college last year

b)

the cumulative GPA of one student who graduated from the college last year

c)

all students who graduated from the college last year

d)

a group of students who graduated from the college last year, randomly selected

e)

the average cumulative GPA of students who graduated from the college last year

20.
Taking a SRS from three homogenous groups
a)
Stratified
b)
Cluster
c)
Multistage
d)
Systematic
21.
Taking a SRS of three diverse groups
a)
Stratified
b)
Cluster
c)
Multistage
d)
Systematic
22.
Undercoverage in a survey produces 
a)
sampling variation
b)
errors in the results
c)
bias
d)
systemic variation
23.
A random sampling method is generally
a)
consistent
b)
unbiased
c)
accurate
d)
simple
24.
Which method is best?
a)
SRS
b)
cluster
c)
stratified
d)
it depends on the context
25.
Random assignment of treatments reduces
a)
bias
b)
variation
c)
undercoverage
d)
placebo effect
26.
Sources of variation in an experiment that are planned.
a)
extraneous variables
b)
factors
c)
treatments
d)
blinding
27.
Using a placebo helps reduce
a)
variation
b)
blinding
c)
double-blinding
d)
bias
28.
You should block by gender if you suspect the response to treatments
a)
is different between subjects
b)
is the same in both genders
c)
is high in each gender 
d)
is very different between genders
29.
An observational study can NOT suggest
a)
cause and effect
b)
a significant relationship
c)
two variables are independent
d)
two variables are associated
30.
According to a random telephone survey of 200 adults, 75% of all working adults in the U.S. are satisfied with their current job. What is the population in this survey?
a)
200 adults
b)
adults in the U.S.
c)
75% of adults
31.
Zoie completes a report by asking 70 students across campus. She found that 48% of CTMS students do not wash their hands after using the bathroom. What is the sample size?
a)
48
b)
100
c)
70
d)
CTMS students
32.
A recent survey of 800 seventh graders from across the state shows 4 out of 10 like to play paper football. How many students said they like to play paper football?
a)
40 students
b)
200 students 
c)
320 students
d)
8,000 students
33.
A school randomly chose ten English teachers and asked them which type of juice their students would prefer. Which reason best shows why this sample is not a good sample in this case?
a)
The sample didn't include students.
b)
The sample is too small.
c)
The sample can only be accurate if each teacher is included in the sample
34.
Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?
a)
thirty students who are often tardy
b)
thirty students who are rarely tardy
c)
thirty of her friends
d)
thirty randomly selected students from her school
35.
The entire group studied is called the
a)
sample
b)
population
36.
The part of the population being studied is called the
a)
population
b)
sample
c)
random
37.
A U.S. senator from Maine wants to find out the opinion of the voters in his state on issues concerning education.  The office of the senator passes out surveys on ten street corners in the five major cities in the state of Maine.  Is this random?
a)
Yes
b)
No
38.
Leslie surveyed the 9 youngest students in the elementary school.  Is this sample of the students in the school likely to be representative of all the students in the school?
a)
yes
b)
no
39.

Sporting Illustrated collects data on its readers by asking them to fill out and send in a survey from the June issue.

a)

Convenience

b)

Systematic

c)

Stratified

d)

Simple Random

40.

A group of lobbyists has a list of 100 senators. They decide to talk to every 7th senator on the list about their position on farm subsidies.

a)

Convenience

b)

Systematic

c)

Stratified

d)

Simple Random

41.

A teacher puts all her students' names in hat, then selects 3 names from the hat. These students will take a standardized test.

a)

Convenience

b)

Systematic

c)

Stratified

d)

Simple Random

42.

The president of a college randomly selects 2 students from each department to serve on a student advisory board.

a)

Convenience

b)

Systematic

c)

Stratified

d)

Simple Random

43.

Political webpages often allow readers to rate (if they want to) whether they strongly agree, agree, disagree, or strongly disagree with the President's decision on any given situation. This is a form of:

a)

Self-Selected

b)

Convenience Sampling

c)

Simple Random Sampling

d)

Systematic Random Sampling

44.

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She selects the five closest to her desk.

a)

simple random

b)

Self Selected.

c)

Convenience

d)

Systematic Random

45.

A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.

She picks the student in every 5th seat.

a)

Simple Random

b)

Systematic

c)

voluntary response

d)

convenience

46.

A teacher hands out an index card and asks ALL of her students to write down the following information: age, height (in inches), and what grade they are in.

Which of the following best describes her method of data collection?

a)

Census

b)

Simple Random Sample

c)

Cluster Random Sample

d)

Stratified Random Sample

47.

An independent research company wants to go door to door to survey people in the city of Fontana. The company decides to number all blocks within the city limit, randomly choose 1 block and survey all households on that block.

This is an example of:

a)

Simple Random Sample

b)

Stratified Random Sample

c)

Cluster Random Sample

d)

Systematic Random Sampling

48.

State the type of sample.


In order to determine the average IQ of ninth-grade students, a school psychologist obtains a list of all schools in the local public school system. She randomly selects five of these schools and administers an IQ test to all ninth-grade students at the selected schools.

a)

Stratified Random Sample

b)

Cluster Sample

c)

SRS

d)

Random Sample

49.
A ___ is a large group that includes everything being studied.
a)
Sample
b)
Stratified Sampling Method
c)
Population
d)
Voluntary-Response
50.

A political polling group is interested in learning about the proportion of registered voters who favor a particular candidate for mayor. Which of the following sampling plans may have introduced bias?

a)

Individuals were selected randomly to participate from a list of registered voters.

b)

Every 50th person on a list of registered voters was contacted and asked to identify who they would vote for in the upcoming election.

c)

A list of registered voters was first separated into two lists—one of males and one of females. Then individuals were selected at random from each of the two lists.

d)

A survey was mailed to all registered voters and those who returned the survey make up the sample

e)

None of the above sampling plans creates the potential for bias.

51.

Which of the following doesn’t result in some form of bias?

a)

Choosing AP students to survey regarding their GPA in order to estimate the average GPA in a school.

b)

Polling a group of potential voters outside a Republican campaign office in order to estimate the proportion of city residents who favor a particular candidate.

c)

Surveying people who work in the marketing department of a large corporation in order to assess employee satisfaction with management policies.

d)

Choosing a stratified random sample of juniors and seniors at a high school in order to estimate the proportion of juniors and seniors who plan to go on to college.

e)

Asking shoppers leaving a grocery store if they think groceries should cost less in order to estimate the proportion of city residents who think groceries cost too much.

52.
What is the minimum value?
a)
64
b)
58
c)
66
d)
60
53.
What is the maximum value?
a)
58
b)
66
c)
64
d)
60
54.
What data value is the upper quartile (Q3)?
a)
64
b)
62
c)
66
d)
58
55.
What data value is the upper quartile (Q3)?
a)
64
b)
62
c)
66
d)
58
56.
What is the median?
a)
62
b)
58
c)
66
d)
60
57.
Which city has a higher median?
a)
Millersburg
b)
Arcadia
58.
Which best represents the Interquartile Range
a)
15
b)
93
c)
85
d)
78
59.
Find the Median
a)
98
b)
93
c)
78
d)
85
60.
What is the range of the set of data?
a)
70
b)
65
c)
80
d)
55
61.
Which city has a higher median?
a)
Millersburg
b)
Arcadia
62.
Which city has a higher median?
a)
Millersburg
b)
Arcadia
63.
If 44 values were used for the data, about how many data values are greater than the 1st quartile?
a)
11
b)
22
c)
33
d)
128
64.
True of false, 75% of the data values are greater than 18?
a)
True
b)
False, 75% of the values are greater than 16
c)
False, 50 % of the values are greater than 18
d)
False, 25% of the values are greater than 18
65.

How many students sent between 10 and 19 text?

a)

25

b)

22

c)

15

d)

45

66.
Shape?
a)
Skewed right
b)
Skewed left
c)
Symmetric
d)
Unimodal
67.

What is the shape of this bar graph?

a)

Skew right

b)

Skew left

c)

Symmetrical

d)

uniform

68.
Describe the histogram:
a)
Left Skewed
b)
Normal/Symmetrical
c)
Right Skewed
d)
Uniform/Flat
69.
a)

skewed left

b)

skewed right

c)

symmetrical

70.
What kind of correlation?
a)
Positive
b)
Negative
c)
No
71.
What kind of correlation?
a)
Positive
b)
Negative
c)
No
72.
What kind of correlation?
a)
Positive
b)
Negative
c)
No
73.
What kind of correlation?
a)
Positive
b)
Negative
c)
No
74.

Estimate the correlation coefficient for this scatterplot.

a)

A) r = 1.2

b)

B) r = 0.89

c)

C)r = 0

d)

D) r = -0.89

75.

What would be an appropriate correlation (r) relating the number of kids you have and the number of points the Vikings score in a game?

a)

r = 1

b)

r = 0.43

c)

r = 0

d)

r = - 0.35

e)

r = -1

76.

A correlation value (r) that has a strong, positive linear association would have a value close to

a)

1

b)

0

c)

-1

d)

Cannot be answered

77.

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

a)

A) The more books students read, the lower their English grade.

b)

B) The more books students read, the higher their English grade.

c)

C) The fewer books students read, the higher their English grade.

d)

D) No relationship exists between the number of books students read and their English grades.

78.

As x increases, y increases

a)

A) correlation coefficient

b)

B) causation

c)

C) positive correlation

d)

D) negative correlation

79.

As x increases, y decreases.

a)

A) no correlation

b)

B) negative correlation

c)

C) correlation coefficient

d)

D) positive correlation

80.
How do you calculate a residual?
a)
Observed - Predicted
b)
Predicted - Observed
81.
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
82.
Shown is a residual plot. Would a linear regression model of the data be most appropriate?
a)
YES
b)
NO
83.
Estimate the correlation coefficient.
a)
r = -0.8
b)
r = -0.5
c)
r = 0.5
d)
r = 0.8
84.
Estimate the correlation coefficient for this scatterplot.
a)
r = 1.2
b)
r = 0.89
c)
r = 0
d)
r = -0.89
85.
Shown is a residual plot. Would a linear regression model of the data be most appropriate?
a)
YES
b)
NO
86.
In a scatterplot r is called
a)
Coefficient of Determination
b)
Correlation coefficient
c)
Regression Line
d)
Slope
87.
A scatter plot and residual plot are the same thing.
a)
True
b)
False
88.
LSRL stands for
a)
Least Sum Regression Line
b)
Least Squares Regression Line
c)
Lower Standard Regression Line
d)
Line Scatterplot Regression Line
89.

The scatter plot shows the number coffee shops in different cities and the number of violent crimes. Which of the following is NOT true?

a)

A) As the number of coffee shops increase, violent crimes appears to increase.

b)

B) The line of best fit (regression line) shows a positive correlation

c)

C) The data has a positive correlation coefficient

d)

D) An increase in coffee shops causes an increase in violent crimes

90.
a)
This residual graph represents a linear fit.
b)
This graph represents a nonlinear fit.
c)
This residual graph represents no fit.
91.
a)
This residual plot represents a linear fit.
b)
This residual plot represents a nonlinear fit.
c)
This residual plot represents no fit.
92.
a)
Positive, strong
b)
Positive, weak
c)
Negative, strong
d)
Negative, weak
93.
a)
Positive, strong
b)
Positive, weak
c)
Negative, strong
d)
Negative, weak
94.
The linear regression equation is y = 61.93x - 1.79.  Use the equation to predict how far this person will travel after 10 hours of driving.
a)
10 miles
b)
617.5 miles
c)
0.19 miles
d)
500 miles
95.
If Joe worked 30 hours, how much is he expected to earn?
a)
$600
b)
$200
c)
$1000
d)
$800

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