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AP Statistics Throwback Review

Total questions: 18

Worksheet time: 40mins

Name
Class
Date
1.
Which of the following best describes a Type I error?
a)
The null is true, but we mistakenly reject it.
b)
The null is false and we reject it.
c)
The null is false, but we fail to reject it.
d)
The null is true but we fail to reject it.
2.
When p-value is greater than alpha we:
a)
Accept Ho
b)
Accept Ha
c)
Fail to reject Ho
d)
Reject Ho
3.

Which of the following best describes a Type II error?

a)

The null is true but we mistakenly reject it.

b)

The null is false but we mistakenly reject it.

c)

The null is false but we fail to reject it.

d)

The null is true but we fail to reject it.

4.
What does it mean when a test is statistically significant?
a)
it has reached alpha level status
b)
the test statistic had a P-value higher than the alpha level
c)
the test statistic had a P-value lower than the alpha level
d)
it is important in practical terms
5.

A tire manufacturer claims that one particular type of tire will last at least 50,000 miles. A group of angry customers do not believe this is so. They take a sample of 14 tires to test if the mean mileage of the tires is really less than 50,000. What set of hypotheses are they interested in testing?

a)

a) H0: m = 50,000 vs. Ha: m < 50,000

b)

b)H0: x̅ = 50,000 vs. Ha: x̅ < 50,000

c)

c)H0: m = 50,000 vs. Ha: m ≠ 50,000

d)

d)H0: m = 50,000 vs. Ha: m > 50,000

6.
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
b)
P
c)
phat
d)
standard deviation
7.
What happens to the shape of a sampling distribution of sample means as n increases?
a)
It becomes narrower and bimodal.
b)
It becomes narrower and more normal.
c)
It becomes wider and skewed right. 
d)
It becomes wider and more normal. 
8.
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
9.
The weights of unicorns are given by N(1000, 25). What is the probability that a unicorn weighs less than 975 pounds?
a)
15.87%
b)
84.13%
c)
46.02%
d)
12.05%
10.
If I toss a fair coin five times and the outcomes are TTTTT, then the probability that tails appears on the next toss is 
a)
0.5. 
b)
less than 0.5. 
c)
greater than 0.5. 
d)
0.
11.

The median is a better description of central tendency than the mean when the distribution is

a)

Symmetrical

b)

Skewed

c)

Normal

d)

Bimodal

12.

Which of the following is an incorrect assumption about the box and whisker plots graphed above? Select all that apply.

a)

The median of 1st period is equal to the first quartile of 2nd period

b)

The spread of the data is larger in 1st period than in second period

c)

75% of the data for 2nd period lies at or above the mean of first period

d)

2nd period has a smaller number of data points than 1st period.

e)

1st period has a larger range of scores and is less consistent than 2nd period.

13.
All of the below sets have the same mean.
Set 1-Standard Deviation=3.1
Set 2-Standard Deviation=4.9
Set 3-Standard Deviation=1.7
Set 4-Standard Deviation=3.2
Which set of data probably has the points closest to the mean?
a)
1
b)
2
c)
3
d)
4
14.
A marketing research firm wished to determine if the adult men in Laramie, Wyoming, would be interested in a new upscale men's clothing store. From a list of all residential addresses in Laramie, the first selects a simple random sample of 100 and mails a brief questionnaire to each. The population of interest is
a)
all adult men in Laramie, WY
b)
all residential addresses in Laramie, WY
c)
the members of the marking firm conducting the survey
d)
the 100 addresses to which the survey was mailed
15.
Consider an experiment to investigate the effectiveness of different insecticides in controlling pests and their effects on subsequent yield. What is the best reason for randomly assigning treatment levels (spraying or not spraying) to the experimental units (farms)?
a)
Randomization makes the experiment easier to conduct since we can apply the insecticide in any pattern rather than in a systematic fashion.
b)
Randomization will tend to average out all other uncontrolled factors such as soil fertility so that they are not confounded with the treatment effects.
c)
Randomization makes the analysis easier since the data can be collected and entered into the computer in any order.
d)
Randomization is required by statistical consultants before they will help you analyze the experiment.
16.

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

17.

A teacher splits her classes up by period. She then randomly picks 3 students from each period to do a survey.

a)

Stratified.

b)

Systematic

c)

Cluster

d)

Biased.

18.

Who would win in a fight with no rules?

a)

Mr. Frazier

b)

Mrs. G

c)

Mr. Gunn

d)

Mrs. Gooch

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