In an effort to increase production of an automobile part, the factory manager decides to play music in the manufacturing area. Eight workers are selected, and the number of items each produced for a specific day is recorded After one week of music, the same workers are monitored again. The data are given in the table. At α = 0.05, can the manager conclude that the music has increased production?

a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Compute the test value.
d. Make the decision.
e. Summarize the results.

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Worker Before After 6 8 10 9 5 12 9 7 10 12 9 12 8 13 8 10