The following are mood scores for 12 participants before and after watching a funny video clip (higher values indicate better mood). a. Calculate the paired-samples t statistic for these mood scores....

The following are mood scores for 12 participants before and after watching a funny video clip (higher values indicate better mood).

a. Calculate the paired-samples t statistic for these mood scores.

b. Using a one-tailed hypothesis test that the video clip improves mood and a p level of 0.05, identify the critical t values and make a decision regarding the null hypothesis.