Exam 3 - Solns

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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

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.

Page1 / 6

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online