1.Does a state's sales tax rate have a significant impact on Dillard's decision to open stores there?

No

2.The coefficient for state sales tax is positive but not significantly different from zero. What does that suggest? Is the coefficient different than what you would expect? Why or Why not?

3.The adjusted R-squared tells us how much of the variance is explained by this model. The adjusted R-Squared is less than zero, suggesting it doesn't do a very good job. What do you think would do a better job in predicting the number of stores in a state than sales tax rate?