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146
CHAPTER 9. HYPOTHESIS TESTING: SINGLE MEAN AND SINGLE
PROPORTION
C.
The average is still about the same as it was in 1995.
D.
The test is inconclusive.
Exercise 9.44
(Solution on p. 150.)
The Type I error is:
A.
To conclude the average hours per week in 2007 is higher than in 1995, when in fact, it is
higher.
B.
To conclude the average hours per week in 2007 is higher than in 1995, when in fact, it is
the same.
C.
To conclude the average hours per week in 2007 is the same as in 1995, when in fact, it is
higher.
D.
To conclude the average hours per week in 2007 is no higher than in 1995, when in fact,
it is not higher.
9.3 Review Questions
7
Exercise 9.45: REVIEW QUESTION 1
(Solution on p. 150.)
1. Rebecca and Matt are 14 year old twins. Matt’s height is 2 standard deviations below the mean
for 14 year old boys’ height. Rebecca’s height is 0.10 standard deviations above the mean for 14
year old girls’ height. Interpret this.
A.
Matt is 2.1 inches shorter than Rebecca
B.
Rebecca is very tall compared to other 14 year old girls.
C.
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 Fall '08
 Ripol
 Statistics

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