Researchers surveyed 1875018750 adults about their regular use of sunscreen, and then assessed whether each adult had developed melanoma in the past 55 years. They concluded that regular sunscreen users had a different melanoma risk than nonusers. What is the response variable, and what is the explanatory variable?

Response variable: Melanoma occurrence (Yes/No)Explanatory variable: Regular sunscreen use (Yes/No)

Response variable: 55-year periodExplanatory variable: Sample size

Response variable: Sample sizeExplanatory variable: Age of participants

Response variable: Regular sunscreen use (Yes/No)Explanatory variable: Melanoma occurrence (Yes/No)

Researchers surveyed 1875018750 adults about their regular use of...

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