Need solve just for Question C pleas 1.22. Plastic hardness. Refer to Problems 1

Question

Need solve just for Question C pleas 1.22. Plastic hardness. Refer to Problems 1.3 and 1.14. Sixteen batches of the plastic were made and from each batch one test item was molded. test item randomly assigned to one the four time levels, and the hardness was measured after the assigned elansed time. The results are shown below: X is the elapsed time in hours, and Y is hardness in Brinell units. Assume that first-order regression model (1.1) is appropriate. 253 246 199 205 196 248 a. Obtain the estimated regression function. Plot the estimated regression function and the data. Does a linear regression function appear to give a good fit here? Obtain 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.

Explanation / Answer

c. beta represents the slope of the estimated regression line and therefore it indicates the change in the mean response when X increases by one measurement.

As it is mentioned u have already done a and b. So mention beta from that.

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