Chapter 2 Answers

Chapter 2 Answers - Chapter 2 Answers 1. a) Observational...

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Chapter 2 Answers 1. a) Observational study, as the students chose whether to take a music class. b) Yes. The rate of high GPA’s for music students is much higher than that of non- music students. c) No. The data shows a link, but it cannot show a casual relationship. d) Possible answers: students may play music even if not in a music class; music classes tend to give more A’s than non-music classes, bolstering the GPA’s of music students. 2. a) Observational study, because the people chose how long to stay in the sun. b) Possible answers: geographical location; family history of skin cancer; age. 3. a) Observational study b) The common family backgrounds eliminate one possible confounding factor, making the study more believable. c) No. Observational studies can only show an association, not a causal link. Possible confounding factors include age and susceptibility to peer pressure. 4. a) Observational study
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This note was uploaded on 04/14/2008 for the course MATH 1680 taught by Professor Patton during the Fall '08 term at North Texas.

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Chapter 2 Answers - Chapter 2 Answers 1. a) Observational...

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