Please help me calculate the p-value show the work please 21. A market research

Question

Please help me calculate the p-value

show the work please

21. A market research firm used a sample of individuals to rate the purchase potential of a particular product before and after the individuals saw a new television commercial about the product. The purchase ratings were based on a 0 to 10 scale, with higher values indicating a higher purchase potential. Conduct a hypothesis test that would show that the commercial improved the mean purchase potential rating. Use = .05 and the following data to test the hypothesis and then comment on the value of the commercial Individual After Before 4 4 Test Stat: t=131 df-7 Critical Value: 1.895 p-value Ha:

Explanation / Answer

Range of p-value:

Go to t-table, row df=7. The t-test statistics lies between values  1.119 and 1.415. Corresponding one tail probabilities are 0.10 and 0.15.

That is p-value lies between 0.10 and 0.15.

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Exact p-value:

Use excel function "=TDIST(1.36,7,1)" gives the exact p-value 0.1080.

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