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Unformatted text preview: Stat 20: solutions to homework 1 Michael Lugo August 30, 2010 recommended exercises (not to be turned in): Chapter 2: Set A: 1, 5, 9, 11. Chapter 3: Set A: 4, 7, 8. B: 1. C: 1, 4. E: 2. required exercises (to be turned in): Chapter 2, Review: 2, 6, 8. Chapter 3, Review: 3, 5, 8, 10. General notes for the grader: feel free to be harsh and not give credit for poorly-written explanations. Also, please make sure all scores are whole numbers. Total scores are out of 34. Chapter 2, Review 2 (a) We cant make any conclusion, because we dont know how many Corvettes and how many Infiniti Q45 sedans there are; we must control for this. (b) Again we cant make any conclusion; we have to control for the number of cars of each type. (c) False! The rate is low because the denominator is large relative to the numerator . Chapter 2, Review 6 Subjects who didnt improve during the first part of the trial probably con- cluded that they were on the placebo (whether they were or not). When the second half of the experiment started, they concluded that theyd been...
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