Exam2Key - STAT 350 MidTerm 2 (11/8/2011) Fall 2011 Section...

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1 STAT 350 MidTerm 2 (11/8/2011) Fall 2011 Section (circle): 12:30 pm 2:30 pm 3:30 pm Name: __ Key ____________________________________ INSTRUCTIONS 1. Calculators and your cheat sheet are allowed. Exam is closed book/closed notes. 2. There are 6 pages front and back for the exam in addition to the cover sheet. You may tear off the last pages (tables) to make your work easier. However, these sheets must be returned. 3. All numeric answers must have at least 3 decimal places. 4. Work is required to receive credit. Partial credit will be given for work that is partially correct. Points will be deducted for incorrect work even if the final answer is correct. 5. Please attach your cheat sheet, tables and any scrap paper used to the exam. 6. Good Luck! Question Possible Score 1 24 2 12 3 5 4 20 5 30 6 16 Total 107 Note: I added 5 points to everyone‟s score because the exam was long.
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3 (24 pts.) 1. Multiple choice questions. Please circle your answer. There is only one correct answer for each choice. (3 pts. each) a) 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 recomputed the new average. b) Suppose we are testing the hypothesis H 0 : μ = 0.5 vs H a : μ ≠ 0.5 and the only information we are given is the sample size n = 60. What would be the type I error when testing the above hypothesis? A) You claim that the true mean is not 0.5 when it really is 0.5. B) You claim that the true mean is not 0.5 when it is really not 0.5. C) You claim that the true mean is 0.5 when it really is 0.5. D) You claim that the true mean is 0.5 when it is really not 0.5. c) Suppose that we do not have a random sample, the results from our confidence interval and hypotheses tests are still good as long as we have a large n so that the Central Limit Theorem applies. A) True B) False d) A statistically significant result will always be practically important.
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Exam2Key - STAT 350 MidTerm 2 (11/8/2011) Fall 2011 Section...

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