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Show all work! Can't figure these two out! Calculate the margin of error of a confidence interval for the population mean at the given level

Show all work! Can't figure these two out!

Calculate the margin of error of a confidence interval for the population mean at the given level of confidence

n = 100, = 5.12, c = 0.99

Construct a confidence interval for the population mean at the given level of confidence

n = 64, = 2.1, c = 0.95, sample mean = 22.15

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