a) p-value = 0.0217
D. Do not reject H_(0), since the p-value is greater than or equal to the significance level alpha .
b) p-value = 0.2549
C. Do not reject H_(0), since the p-value is less than the significance level alpha .
c) p-value = 0.0319
D. Do not reject H_(0), since the p-value is greater than or equal to the significance level alpha .