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Suppose that the mean time spent on Facebook is 19.5 minutes with a standard deviation of 12 minutes. A study of 100 visits shows a

Suppose that the mean time spent on Facebook is 19.5 minutes with a standard deviation of 12 minutes. A study of 100 visits shows a sample mean of 21.5 minutes. Use a = 0.05 to test whether the mean time spent on Facebook has increased.

Please use Excel formula's

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