Mathematics, 30.01.2020 16:04 sierranowe2003

Efficiency experts 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 81 clamps, the mean time to complete this step was 56.8 seconds. assume that the population standard deviation is 9 seconds. what is the lower bound of the 98% confidence interval?

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