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Confidence interval for standard deviation of wage rate per

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In a random variable of 100 workers you find the average wage is $21.00 per hour and the standard deviation of wage is $4.00 per hour. What is the 99% confidence interval for mean hourly wages? (Note that with n=100 Pr (t.2.364)=0.01 and Pr (t>2.626)=0.005

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