Q Math 54 Collected Work Section 1.2 Collected Work Name: Total points: 10 1. (4) Determine whether the study depict an observational study or an experiment. a. A survey is conducted asking 400 people, “Do you prefer Coke or Pepsi?” b. 7th grade students are randomly divided into two groups. One group is taught math using traditional techniques; the other is taught math using a reform method. After 1 year, each group is given an achievement test to compare proficiency. 2. (6) Is a television (TV) in the bedroom associated with obesity? Researchers questioned 379 twelve- year old adolescents and concluded that the body mass index (BMI) of the adolescents who had a TV in their bedroom was significantly higher than the BMI of those who did not have a TV in their bedroom. (a) What type of observational study is this? Explain (b) What is the response variable in the study? What is the explanatory variable? (c) Can you think of any lurking variables that may affect the results of the study? (d) Can we conclude that a television in the bedroom causes a higher body mass index? Explain. 1

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