Consider the following competing hypotheses and accompanying results from matched samples:
H0: µD ≥ 0; HA: µD < 0
= 22.8 , sD = 5.7 , n = 12
a. At the 5% significance level, find the critical value(s).
b. Calculate the value of the test statistic under the assumption that the sample difference is normally distributed.
c. What is the conclusion to the hypothesis test?