ONLY NEED ANSWERS FOR 526 526 Refer to Plastic hardness Prob

ONLY NEED ANSWERS FOR 5.26!!

5.26. Refer to Plastic hardness Problems 1.22 and 5.7.

c. Obtain the matrix of the quadratic form for SSE.

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a. Obtain the estimated regression function. Plot the estimated regression function and the data. Does a linear regressio function appear to give a good fit hear?

b. Obatin a point estimate of the mean hardness when X=40 hours.

c. Obtain a point estimate of the change in mean hardness when X increases by 1 hour.

Solution