8. A school district wishes to construct a 99% confidence interval for the true
ID: 3153124 • Letter: 8
Question
8. A school district wishes to construct a 99% confidence interval for the true mean achievement test score for its students. How large a sample must be taken to obtain a margin of error no more than 2 points? Assume the standard deviation of the scores for all students is 9.5. A. 599 B. 150 C. 124 D. 13 E. 178
9. A pharmaceutical company claims that its weight loss drug allows women to lose at least 8 lb after one month of treatment. If they wish to conduct an experiment to test (refute) this claim, which of the following hypotheses should be used? A. $#: µ = 8 $%: µ > 8 B. $#: µ = 8 $%: µ 8 C. $#: µ 8 $%: µ < 8 D. $#: µ = 8 $%: µ < 8 E. $#: µ 8 $%: µ > 8
11. The Department of Transportation of the State of New York claimed that it takes an average of 200 minutes to travel by train from New York to Buffalo. A random sample of 40 trains was taken and the average time required to travel from New York to Buffalo was 188 minutes; assume a standard deviation of 28 minutes. What is the p-value for this test? A. .0355 B. .0068 C. .1294 D. .2881 E. 0.0034
Explanation / Answer
Solution : 9)
D. $# : µ = 8 $%: µ < 8
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