Question: A U.S. Web Usage Snapshot indicated a monthly average of 36 Internet visits per user from home. A random sample of 24 Internet users yielded

A U.S. Web Usage Snapshot indicated a monthly average of 36 Internet visits per user from home. A random sample of 24 Internet users yielded a sample mean of 42.1 visits witha standard deviation of 5.3. At the 0.01 level of significance, can it be concluded that this differs from the national average? I just need help finding the critical t value.

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