Quality control technician for a manufacturer

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You work as a Quality Control Technician for a manufacturer of kitchen countertops and your job is to randomly sample countertops to ensure product consistency...

The machining time for each countertop is, on average, 20.2 seconds for a particular machine centre.

  1. a) If it is known that the standard deviation is 4 seconds, what is the probability that the sample mean will lie between 19.2 seconds and 21.2 seconds in a sample of 4 countertops? Show and explain what happens when the sample size is increased from 4 to 16? (assume an infinite population)

Reference no: EM132156988

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