Use the data in MACRO.XLS and statistical software to determine if changes in real disposable personal income (RDPI) precede changes in real consumer spending (RCONS) or vice versa using lag lengths of 8 for both variables.

(A) Do you reject the null hypothesis that RDPI does not precede RCONS at the 5% critical level?

(B) Would you reject the null hypothesis that RDPI does not precede RCONS at the 10% critical level? Explain.

(C) Do you reject the null hypothesis that RCONS does not precede RDPI at the 5% critical level?

(D) Would you reject the null hypothesis that RCONS does not precede RDPI at the 10% critical level? Explain.