Refer to the previous exercise. Suppose you wanted to generate a similar table but have it based on results from only one multiple regression rather than on three.
Describe what additional explanatory variables you would need to include in your regression model and write out the model.
In the actual table, the importance (b coefficient) of marketing orientation appears to decrease as the firm size increases. Based on your model in part (a), describe an test to see if marketing coefficient is different across the three firm sizes.
Explain why this test is more appropriate compared to using tests to compare each pair of coefficients.