11.39 Selecting from among several models. Refer to the results from the previous exercise.

  1. (a) Make a table giving the estimated regression coefficients, standard errors, t statistics, and P-values.

  2. (b) Describe how the coefficients and P-values change for the four models.

  3. (c) Based on the table of coefficients, suggest another model. Run that model, summarize the results, and compare it with the other ones. Which model would you choose to explain LSI? Explain.