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Hypothesis test comparing sample mean to population mean

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A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher thatn $7.58 A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65.

At a(alpha) =0.05 what is the test value?

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