EBook Problems Hypothesis L Mean
Revision as of 02:44, 27 November 2008 by JayZzz (talk | contribs) (New page: == EBook Problems Set - Testing a Claim about a Mean: Large Samples== ===Problem 1=== Hong is a pharmacist studyin...)
EBook Problems Set - Testing a Claim about a Mean: Large Samples
Problem 1
Hong is a pharmacist studying the effect of an anti-depressant drug. She organizes a simple random sample of 100 patients, and then collect their anxiety test scores before and after administering the anti-depressant drug. Hong wants to estimate the mean difference between the pre-drug and post-drug test scores. How should she proceed?
- Choose one answer.
- (a) She should compute a confidence interval or conduct a hypothesis test
- (b) She should calculate the z or the t statistics
- (c) She should compute the correlation between the two samples
- (d) Not enough information to tell
Answer
Problem 2
A utility company serves 50,000 households. As part of a survey of customer attitudes, they take a simple random sample of 750 of these households. The average number of television sets in the sample households turns out to be 1.86, and the standard deviation in the sample is 0.80. What sample size would be necessary for the standard error of the sample mean to be 0.02?
- Choose one answer
- (a) 5,000
- (b) 1,600
- (c) 10,000
- (d) 1,000
Answer
- Back to Ebook
- SOCR Home page: http://www.socr.ucla.edu
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