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Unformatted text preview: Physics 101 Classical Physics Spring 2010 Quiz 1 Instructions : The answer sheets must be handed in as soon as time is called. You have until 9:20am. Answer the following two multiple choice questions. Each question is worth 5 points. 1. A study follows 20 overweight patients who have high levels of low-density lipoprotein (LDL) cholesterol. Ten (10) of the patients are put on a low LDL diet, the others continue to eat as they always have. Of the 10 on the low LDL diet, 3 have heart attacks in the first 5 years of the study. Of those on the nor- mal diet, 6 have heart attacks in the first 5 years of the study. The researches conclude that lowering LDL levels reduces the risk of heart attack. Which of the following represent is a source of systematic error on this conclusion? (a) The number of people in the study. (b) The number of people who ate the low LDL diet. (c) The fact that on the low LDL diet, the people lost weight while those on the normal diet remained overweight. (d) The fact that there were two groups being examined. (e) The fact that the study was not sponsored by a pharmeceutical company. Certainly the statistical uncertainties are large, because they have so few people in the study....
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This document was uploaded on 05/20/2010.
- Spring '09