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Consider a population with a known standard deviation of 25.2. In order to compute an interval estimate of the population mean, a sample of 60

Consider a population with a known standard deviation of 25.2. In order to compute an interval estimate of the population mean, a sample of 60 observations is drawn.

a. Compute the margin of error at a 95% confidence level.

b. Compute the margin of error at a 95% confidence level based on a larger sample of 225 observations.

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