1. The UPBEAT study investigated aerobic exercise as a treatment for depression in individuals with coronary heart disease 37 participants were randomly assigned to a 16-week exercise regimen0 participants to take an antidepressant drug for 16 weeks, and 24 participants to take a placebo pill. The me measure was participants' score on the Hamilton Depression Rating Scale, which ranges from 0 to 52, with lower scores indicating less depression. How many cases were there in this study? identify the factor (experimental) variable in this study andits levels O 37 eandom wet exercise At the beginning of the study, investigators recorded the age, gender, and initial score on the 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: Gender Score: categorical Cnumerical tegorical numerical categorical numerica hy did the investigators caution that "patients who were not interested in exercise ortaking an antidepressant were unlikely to have volunteered" to be in the study? Because hose are he quimernents. Th intrsta in exertise or tatira0 won+ b accurat and teeir wilh be co plus bias. In addtior This ran leod to high vathabiity ssarts or else tre cnableS

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