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Many professionals work an average of 85 hours per day a

Many professionals work an average of 8.5 hours per day. A CEO claims the mean work day of their firm's accountants is less than 8.5 hours. A random sample of 25 of the firm's accountants has a mean work day of 8.2 hour what a standard deviation of 0.5 hours. At a significance level of 0.01, test the CEO's claim.

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Mathematics: Many professionals work an average of 85 hours per day a

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