A study conducted a few years ago claims that the adult males spend an average of 10.5 hours a week watching sports on television with a standard deviation of 4.2 hours. A recent sample of 50 adult males showed that the mean time spent per week watching sports on television is 12 hours. Test at the 1% level of significance if currently male adults spend more than 10.5 hours per week watching sports on television.

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Q: he mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A:

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Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

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