Refer to the data of Example 12.6. a. Test, against a two-sided alternative, the null hypothesis that,

Question:

Refer to the data of Example 12.6.
a. Test, against a two-sided alternative, the null hypothesis that, all else being equal, median per capita personal income has no influence on the effective property tax rate.
b. Test the null hypothesis that, taken together, the three independent variables do not linearly influence the effective property tax rate.