The foreman in a small assembly plant believes that playing classical music in the plant will improve worker productivity. To try to prove his point, the foreman conducts an experiment. He records the average daily production levels for a random sample of workers overa four-week period. He then plays music in the plant, and records the average daily production levels for the same workers over another four-week period (some time after the music was started). The results of the study are shown on the next page in Exhibit 9.14.

Is there sufficient evidence, at the 4% significance level, to suggest that playing classical music led to increased worker productivity?

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Average Daily Production Average Daily Production After Worker Before Music Music 18 18 14 15 10 12 4 11 15 9. 10 11 11 14 10 11 10 12 12