Twenty volunteers were assigned at random to one of two groups (10 people in each group). One group would take Vitamin C for two weeks, while the second group would take a placebo. At the end of the study, the proportion of colds in the two groups will be compared. What is the explanatory variable in the study?
a. Getting a cold (or not)
b. Taking Vitamin C (or a Placebo)
c. Getting 8 hours of sleep a night (or not)
d. Exposure to other people with colds (or not)
Question 2
Twenty volunteers were assigned at random to one of two groups (10 people in each group). One group would take Vitamin C for two weeks, while the second group would take a placebo. At the end of the study, the proportion of colds in the two groups will be compared. What is the response variable in the study?
a. Getting a cold (or not)
b. Taking Vitamin C (or a Placebo)
c. Getting 8 hours of sleep a night (or not)
d. Exposure to other people with colds (or not)
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