Refer to Problem 15-45.
a. Develop the correlation matrix that includes all independent variables and the dependent variable. Predict the order that the variables will be selected into the model if forward selection stepwise regression is used.
b. Use forward selection stepwise regression to develop a model for predicting the number of calls that the company will receive. Write a report that describes what has taken place at each step of the regression process.
c. Compare the forward selection stepwise regression results in part b with the backward elimination results determined in Problem 15-45. Which model would you choose? Explain your answer.
In exercise
y = Number of calls
x1 = Number of advertisements placed the previousweek
x2 = Number of calls received the previous week
x3 = Number of airline tour bookings into Western cities for the current week