60 POINTS!! HELP ME FIND INDEPENDENT AND DEPENDENT VARIABLES FOR EACH OF THESE !!!

a. Students are planning a program to promote “safe sex” and the awareness of other health concerns for college students. To measure the effectiveness of the program, they plan to give a survey measuring the increase in knowledge to a random sample of students before and after the program.

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b. Examine the effect of physician triage in an emergency department on daily “left without being seen rates”. Study was performed during a 1 year period.

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c. Determine whether parent income level has an effect on childhood obesity, as measured by BMI categories.

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