Choose all of the correct alternatives. A dermatologist wants to study the effects of a new product on teenage acne. She selects three groups of teenagers from her practice. A control group is given a "placebo" cream to use for 3 months. A second group is given the new product, "Zit go Away," to use for 3 months, and the third group is given her old product, "Acne Plus," to use for the same period. At the end of the treatment period each teen is assessed by an independent physician who records the proportion of skin area free of acne break-outs.
a. Type of cream is the independent variable.
b. Type of cream is the dependent variable.
c. The independent variable has three values.
d. The skin assessment measure is the independent variable.
e. The dependent variable is continuous.
Ans: a,c.e
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