This exercise requires the use of a computer package. The cotton aphid poses a threa...

This exercise requires the use of a computer package. The cotton aphid poses a threat to cotton crops in Iraq. The accompanying data on appeared in the article “Estimation of the Economic Threshold of Infestation for Cotton Aphid” (Mesopotamia Journal of Agriculture [1982]: 71–75). Use the data to find the estimated regression equation and assess the utility of the multiple regression model

y = infestation rate (aphids/100 leaves)

x ₁ = mean temperature (=C)

x ₂ = mean relative humidity