A family would like to build a linear regression equation to predict the amount of grain harvested per acre of land on their farm. They subdivide their land into several smaller plots of land for testing and would like to select an explanatory variable they can control. Which of the following is an appropriate explanatory variable that the family could use to create a linear regression equation? (A) (B) (C) (D) (E) The total amount of rainfall recorded at their farm The type of crop planted in the plot the previous year The average daily temperature at their farm The variety of grain planted in the plot The amount of fertilizer applied to each plot of land

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 A family would like to build a linear regression equation to predict the amount of grain harvested per acre of land
on their farm. They subdivide their land into several smaller plots of land for testing and would like to select an
explanatory variable they can control. Which of the following is an appropriate explanatory variable that the family
could use to create a linear regression equation?

(A)
(B)
(C)
(D)
(E)
The total amount of rainfall recorded at their farm
The type of crop planted in the plot the previous year
The average daily temperature at their farm
The variety of grain planted in the plot
The amount of fertilizer applied to each plot of land

Why is it that the correct answer is letter E? Why not D? Please explain to me the reason for other choices to be wrong. Thanks!

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