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AP Stats Test Review
AP Stats Test Review
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1
Which of the following is the best way to increase the power of a test?
Increase α
Perform a confidence interval as a follow-up
Increase sample size
Replicate the test
2
How long do teens typically spend brushing their teeth? (Which test/interval is best?)
Two sample z
One sample t
One sample z
Two sample t
3
We usually want statistics with...
low bias and low variability
high bias and low variability
high bias and high variability
low bias and high variability
4
What does this plot say about the fitted linear model?
There is no pattern so the linear model is approriate
There is not enough information to judge the model
There is no pattern so the model is not appropriate
The correlation is strong since there is no pattern
5
Which test was performed?
two sample z
two sample t
one sample z
one sample t
6
You are going to rock this test on May 7th!
I am the master of AP Statistics.
YES!
Duh.
Of course I am!
7
Which of the following is the most important AP Exam strategy for students when writing free response answers?
Use correct punctuation!
Use proper grammar!
Write in context!
Spell correctly!
8
Increasing sample size would NOT reduce which of the following?
margin of error
variability
bias
P(Type 2 error)
9
Which of the following is resistant?
Mean & Standard deviation
Median & IQR
Mean & Range
Median & Range
10
What does the P in p-value represent?
Proportion
Power
Parameter
Probability
11
Determine the sampling method.
Cluster Sampling
Convenience Sampling
Simple Random Sampling
Systematic Sampling
12
Which formula describes Degrees of Freedom for a t-test?
n-(-1)
n-1
m-1
n+1
13
We use a t-distribution instead of a z-distribution when.....
σ is unknown
μ is unknown
When performing a One Prop Z Test
Low sample size
14
A type 2 error could occur when you reject the null hypothesis.
False
True
15
T or F: You will need to bring your formula sheets to the test.
False
True
16
When is the AP Statistics Test?
Tomorrow
May 7
May 13
May 8
17
What is bias?
when the entire population is surveryed
improper hypothesis testing
when you receive unexpected results
the failure of a sampling method to represent the population
18
How do you find the residual? (Hint: RAP: R = A - P)
predicted (x) - observed (x)
predicted (ŷ) - observed (y)
observed (x) - predicted (x)
observed (y) - predicted (ŷ)
19
When should you reject the null hypothesis?
beta < power
alpha < power
alpha > p-value
alpha < p-value
20
The p-value of a statistical test is ....
The probability that the alternative is true
The probability that the null is true
Given the null is true, it is the prob of the obs. or more extreme value
Probability of the observation or one more extreme occuring
21
Which of the following set of numbers constitutes the Empirical Rule?
68 - 95 - 99.7
68 - 90 - 99.5
69 - 95 - 99.7
68 - 90 - 99.7
22
Where is the point estimate of a confidence interval located?
At the upper end of the interval
At the lower end of the interval
In the middle of the interval
It is not in the interval but helps to calculate it
23
In statistics we calculate a confidence interval when we want to ...
Find the sample mean
Determine the alternative hypothesis
Find out if the null hypothesis is true
Estimate a population parameter
24
What is the power of a test?
Probability of not making any error assuming unbiased data
Probability of a Type I error, alpha
Probability of rejecting a false Ho assuming a given true parameter
A measure of how small your alpha is
25
Choose the answer that does NOT represent the symbol below!
Alpha
Type II error
Significance level
Type I error
26
Which test/interval is best? "Which brand of AA batteries last longer - Duracell or Everyready?"
One sample t
One-sample z
Two sample t
Two-sample z
27
What percent of students at your school have a Twitter account? (Which test/interval is best?)
Two sample z
One sample z
One sample t
Two sample t
28
Strong evidence against the null hypothesis exists when?
The power is large
alpha > p-value
The p-value is large
The p-value is small
29
Proportions use __ as a parameter and ___ test statistic. Means use ___ as a parameter and ___ test statistic.
p hat, p, x bar, z
p,z,mu,t
p hat, z, x bar, t
p,z,mu,z
30
Which test is best?
one sample z
two sample t
two sameple z
one sample t
31
Which of the following is NOT a main component for a well designed experiment?
control
blocking
randomization
replication
32
Below is a confidence interval, what is the x-bar called?
point estimate
standard error
Margin of error
sample mean
33
Which of the following is the conditions check for normality in a test for proportions?
(A) n > 30 (large sample size)
(B) np > 10
(C) n(1-p) > 10
Choice (B) and (C)
34
If the p is low...
the ho must go
then the ho must go
Reject the Ho
reject the null hypothesis
35
What is the difference between parameters and statistics?
parameters are exact, statistics not
parameters not exact, statistics are exact
parameters from the population, statistics from the sample
parameters from sample, statistics from the population
