Football coaches running their summer practices noticed that the players who weighed more typically had slower times for their 40-yard dash. What are the explanatory variable and response variable for this relationship?

The explanatory variable is the factor used to explain or predict a change in the other variable. Here, player weight is related to the players’ 40-yard-dash times, so weight is the explanatory variable and dash time is the response variable. Choice D gives this relationship.

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