Mathematics, 10.10.2019 03:00 princessss30188

Researchers wanted to determine if having a supply of sugary snacks in the bedroom is associated with obesity. the researchers administered a questionnaire to 391 twelve-year-old adolescents. after analyzing the results, the researchers determined that the body mass index of the adolescents who had a supply of sugary snacks in their bedroom was significantly higher than that of the adolescents who did not have a supply of sugary snacks in their bedroom. complete parts (a) through (e) below. (a) why is this an observational study
a. this is an observational study because the researchers observe the behavior of the individuals in the study without trying to influence an explanatory variable of the study.
b. this is an observational study because the researchers try to influence the outcome of the study.
c. it is not an observational study

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