step in the manufacture of a certain metal clamp involves the drilling of four holes. In a sample of 150 clamps, the average time needed to complete this step was 72 seconds and the standard deviation was 10 seconds. (i). Find a 95% confidence interval for the mean time needed to complete the step. . (ii). Find the 99% lower confidence interval for the mean time needed to complete the step.. (iii). What is the confidence level of the interval (71, 73)?. (iv). How many clamps mus

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One step in the manufacture of a certain metal clamp involves the drilling of four holes. In a sample of 150 clamps, the average time needed to complete this step was 72 seconds and the standard deviation was 10 seconds.

(i). Find a 95% confidence interval for the mean time needed to complete the step. .

(ii). Find the 99% lower confidence interval for the mean time needed to complete the step..

(iii). What is the confidence level of the interval (71, 73)?.

(iv). How many clamps must be sampled so that a 95% confidence interval specifies the mean to within ±1.5 seconds?.

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