Exam 3 - Solns

# Exam 3 - Solns - STAT 2004 Exam 3 Fall 2007 A Gallup poll...

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Unformatted text preview: STAT 2004 Exam 3 Fall 2007 A Gallup poll of 500 Americans revealed that they anticipated spending an average \$866 on gifts this season. In 2002, Americans expected to spend \$690 on gifts. The standard deviation for money spent on Christmas gifts is known to be \$205. Test whether expected spending has decreased in the last five years. 1. What are the correct hypotheses? a. 690 : H 690 : H A < = x x c. 690 : H 690 : H A < = μ μ b. 690 : H 690 : H A = < μ μ d. 690 : H 690 : H A = μ μ 2. What is the test statistic for this test? a. z * = -429.268 c. z * = 429.268 b. z * = 19.197 d. z * = 1.645 STAT 2004 Exam 3 Fall 2007 True or False? If a two-sided test rejects the null hypothesis H : µ = 160 when α = .05 then a 95% confidence interval for µ would contain 160. a. True b. False c. Not enough information 3. True or False? If we reject the null hypothesis at a significance level of 0.05, then we would also reject the null hypothesis if the significance level were 0.10....
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## This note was uploaded on 03/31/2008 for the course STAT 2004 taught by Professor Melutz during the Fall '07 term at Virginia Tech.

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Exam 3 - Solns - STAT 2004 Exam 3 Fall 2007 A Gallup poll...

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