Football coaches running their summer practices noticed that the players who weighed more typically had slower times for their 40-yard dash.
A
Explanatory variable: season Response variable: player weightB
Explanatory variable: seasonResponse variable: player 40-yard-dash timeC
Explanatory variable: player weightResponse variable: player 40-yard-dash timeD
Explanatory variable: player 40-yard-dash timeResponse variable: player weight