# Question: Refer to the data of Exercise 13 41 Suppose that another

Refer to the data of Exercise 13.41. Suppose that another variable was controlled, that the first four squares at each speed were treated with a .2 concentration of protective coating, and that the second four squares were treated with a .4 concentration of the same coating. Given that x1 de-notes the machine speed and x2 denotes the concentration of the protective coating, fit these models:

y = β0 + β1x1 + β2x12 + β3x2 + ɛ

y = β0 + β1x1 + β2x21 + β3x2 + β4x1x2 + β3x21x2 + ɛ

In exercise

y = β0 + β1x1 + β2x12 + β3x2 + ɛ

y = β0 + β1x1 + β2x21 + β3x2 + β4x1x2 + β3x21x2 + ɛ

In exercise

**View Solution:**## Answer to relevant Questions

A laundry detergent manufacturer wished to test a new product prior to market release. One area of concern was the relationship between the height of the detergent suds in a washing machine as a function of the amount of ...A supermarket chain staged a promotion for organic vegetables. The actual sales (Sales) of organic vegetables for the weekend of the promotion were obtained from scanner data at the checkout. Three explanatory variables ...Refer to Exercise 13.54. a. Formulate a new model using a variable selection procedure with AIC and then BIC as the criterion to select the independent variables. Was there a large difference in the selected variables for ...Refer to Exercise 13.58, examine the relationship between the selling price ( in thousands of dollars) of a home and two independent variables, the number of rooms and the number of square feet. Use the following data. a. ...Refer to Exercise 13.69. a. What is your choice of a good predictive equation? Why did you choose that particular equation? b. The model as constructed does not contain any interaction effects. Construct a model that allows ...Post your question