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Unformatted text preview: STAT511 Final Exam Summer 2009 Part I: Multiple Choice 1. [5 points] The average salary of all female workers is $35,000. The average salary of all male workers is $41,000. what must be true about the average salary of all workers? (a) It must be $38,000. (b) It must be larger than the median salary. (c) It could be any number between $35,000 and $41,000. (d) It must be larger than $38,000. 2. [5 points] A researcher reports that, on average, the participants in his study lost 10.4 lbs. after two months on his new diet. A friend of yours comments that she tried the diet for two months and lost no weight, so clearly the report must be a fraud. Which of the following statements is correct? (a) Your friend must not have followed the diet correctly because she did not lose weight. (b) Because your friend did not lose weight, the report must not be correct. (c) The report gives only the average. This doesn’t imply that all participants in the study lost 10.4 lbs. or even that all participants lost weight. Your friend’s experience doesn’t necessarily contradict the study results. (d) In order for the study to be correct, we must now add your friend’s results to those of the study and recompute the new average. 3. [5 points] In a test of statistical hypothesis, the P-value tells us (a) If the null hypothesis is true. (b) If the alternative hypothesis is true....
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This note was uploaded on 04/23/2011 for the course STAT 503 taught by Professor Staff during the Spring '08 term at Purdue.
- Spring '08