1.26 A study of the effects of skin tone (light, medium, and dark) on the severity of...

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1.26 A study of the effects of skin tone (light, medium, and dark) on the severity of facial wrinkles in middle age might be of interest to dermatologists.

a. What would the independent variable be in this study?

b. What would the dependent variable be in this study?

c. How many levels would the independent variable have?

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