Computing World has asserted that the amount of time owners of personal computers spend on their machines averages 23.9 hours per week and has a standard deviation of 12.6 hours per week. A random sampling of 81 of its subscribers revealed a sample mean usage of 27.2 hours per week. On the basis of this sample, is it reasonable to conclude (using 2 standard errors as the decision criterion) that Computing World’s subscribers are different from average personal computer owners?
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