Random samples of size 40 are taken from a normally distributed population with

Random samples of size 40 are taken from a normally distributed population with a mean equal to 80 and a standard deviation equal to 12. Show detailed calculations to determine the upper and lower control limits
Write the two Excel function equations, using “CONFIDENCE” that would calculate the same UCL and LCL from the question above.
Random samples of size 50 are taken from a population with a given proportion equal to 62%. Show detailed calculations to determine the upper and lower control limits.

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