Assume you are working with the results of a research situation based on a matched sample design involving 25 participants (the same participants in a before/after test situation). The mean difference (D) = 9.72, with an estimate of the standard error of the mean difference (D) = 6.33. Assume that you're working at the .05 level of significance.
a. Formulate an appropriate null hypothesis.
b. Calculate t.
c. Identify the critical value.
d. State your conclusion.