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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 poorlywritten explanations. Also, please make sure all scores are whole numbers. Total scores are out of 34. Chapter 2, Review 2 (a) We can’t make any conclusion, because we don’t know how many Corvettes and how many Infiniti Q45 sedans there are; we must control for this. (b) Again we can’t 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 didn’t 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 they’d been...
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 Spring '08
 Staff
 Statistics, Probability, Michael Lugo

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