content area bottom Part 1 (a) Why is this an observational study? What type of observational study is this? Why is this an observational study? A. The researchers administered a questionnaire to obtain their data without trying to influence an explanatory variable of the study. Your answer is correct.B. The researchers intentionally changed an explanatory variable of the study. C. The researchers observed the behavior of the individuals in the study without trying to influence an explanatory variable of the study. D. The researchers tried to influence the outcome of the study. Part 2 What type of observational study is this? Case-control study Cross-sectional study Your answer is correct. Cohort study Part 3 (b) What is the response variable in the study? Is the response variable qualitative or quantitative? What is the explanatory variable? What is the response variable in the study? Is the response variable qualitative or quantitative? A. The response variable is the body mass index of the adolescents. The response variable is quantitative. B. The response variable is the number of the adolescents who participate in the study. The response variable is quantitative. C. The response variable is whether the adolescent has a video game console in the bedroom or not. The response variable is qualitative. D. The response variable is the number of the adolescents who have a video game console in their bedroom. The response variable is quantitative