Sep 22, 2017 term paper 2

THE STANDARD DEVIATION OF THE LIFE FOR A PARTICULAR BRAND OF ULTRAVIOLET TUBE IS KNOWN TO…

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The standard deviation of the life for a particular brand of ultraviolet tube is known to be500hr, and the operating life of the tubes is normally distributed. The manufacturer claimsthat average tube life is at least 9000 hr.Test this claim at the 5 percent level of significance against the alternative hypothesis that themean life is less than 9000 hr, and given that fora sample of15 tubes the mean operating lifewas8800hr


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