The following are mood scores for 12 participants before and after watching a funny video clip (higher

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

Before Before After After 2 4 3 3 4 3 3


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.

c. Using a two-tailed hypothesis test with a p level of 0.05, identify the critical t values and make a decision regarding the null hypothesis.

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