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efficiency expert study the processes...

efficiency expert study the processes used to manufacture items in order to make them as efficient as possible. one of the steps used to manufacture a metal clamp involves the drilling of three holes. in a sample of 69 clamps the mean time to complete the step was 45.5 seconds. assume that the population standard deviation is 11 seconds. what is the lower bound of the 98% confidence interval.Round one decimal place

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