The following data (Exercise 12.18 and data set EX1218) were obtained in an experiment relating the dependent variable, y (texture of strawberries), with x (coded storage temperature). Use the information from Exercise 12.18 to answer the following questions:

a. What is the best estimate of σ2, the variance of the random error?
b. Do the data indicate that texture and storage temperature are linearly related? Use a = .05.
c. Calculate the coefficient of determination, r2.
d. Of what value is the linear model in increasing the accuracy of prediction as compared to the predictor, ?

Transcribed Image Text:

x -2 -2 022 y 4.0 3.5 2.0 0.5 0.0