study investigated aerobic exercise as a treatment for depression in individuals with articipants were randomly assigned to a 16-week exercise regimen 40 coronary heart disease37 p participants to take an antidepressant drug for 16 weeks primarytdepressant drug for 16 weeks, and 24 participants to take a placebo pill. The 1. The UPBEAT primary outcome measure was ranges from O to 52, with lower scores indicating less depression. participants' score on the Hamilton Depression Rating Scale, which A) [1.5 pt] How many cases were there in this study? 37440424 lol IOI B) [2 pts] Identify the factor lexperimental) variable in this study and its level D 37 eaniomy wek exercise 2 40 antidepressont er @ 2y placabo pll C) [1.5 pts] At the beginning of the study, investigators recorded the age, gender, and initial score on t Hamilton Depression Rating Scale for each person enrolled in the study. Classify each variable as categorical or numerical by circling one answer for each variable below. Age: categorical numerical categoricalnumerical categorical Cnumerica Gender: Score: D) [2 pts] Why did the investigators caution that "patients who were not interested in exercise orta an antidepressant were unlikely to have volunteered" to be in the study? Because those are tre卜equirements. Th, Patien INTest公in exercise or trio arti-epre wont be accuratt and treir wil be co ents ustbe ssans or else tne STu plus bias, In asdtion his ran leod to hign vatiabiity

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