AP Stats Mixed Review #5

This test is used to compare the responses to a treatment in a within-groups design (ie, does an SAT prep course improve an individual’s SAT scores?). A listening test was administered to Spanish teachers before and after an institute designed to improve Spanish listening skills. The maximum possible score on the test was 36. The Pre- and Post-test results for each subject are listed below:

Sub 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Pre 30 28 31 26 20 30 34 15 28 20 30 29 31 29 34 20 26 25 31

Pos 29 30 32 30 16 25 31 18 33 25 32 28 34 32 32 27 28 29 32

Determine if the institute improved listening skills at the 5% significance level.

• 1-sample t-test

• 1-sample t-test (mean difference)

• 2-sample t-test (difference in means)

Which of the following best describes a Type I error?

• The null is true, but we mistakenly reject it.

• The null is false and we reject it.

• The null is false, but we fail to reject it.

• The null is true but we fail to reject it.

• The null is true, and we fail to reject it.

How can you reduce both Type I and Type II errors?

• it can't be reduced
• redo the tests
• increase the sample size
• tamper with the data

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

CCSS.HSS.MD.B.7

Categorical or Quantitative?
Years of schooling completed

• Categorical
• Quantitative

Categorical or Quantitative?
College Major

• Categorical
• Quantitative

Tags

CCSS.HSS.ID.B.5

33, 25, 42, 25, 31, 37, 46, 29, 38
What is the third quartile (UQ) of the data?

• 37
• 38
• 40
• 46

Tags

CCSS.6.SP.A.3

CCSS.6.SP.B.5

CCSS.6.SP.A.2

What does a z-score of 0 mean?

• The score is equal to the mean.
• The score is 0 points. 
• There is no data.
• You can't tell unless you know the data is normal. 

Tags

CCSS.6.SP.A.3

CCSS.6.SP.B.5

A national achievement test is administered annually to 3rd graders. The test has a mean score of 100 and a standard deviation of 15. If Jane's z-score is 1.20, what was her score on the test?

• 82
• 88
• 100
• 118

Tags

CCSS.HSS.ID.A.4

Which is the symbol for population variance?

• μ

• s²

• ΣX

• σ²

Find the area below a z-score of 1.25. 

• 0.89
• 0.01
• 0.79
• 0.12

Tags

CCSS.HSS.ID.A.4