Assuming that the samples come from the normal distributions, find the margin of error E and the interval estimates of the following population mean: 1. n = 10, X = 28, s = 4.0, 90% confidence 2. n = 16, X = 50, s = 4.2, 95% confidence 3. n = 20, X = 68.2, s = 2.5, 90% confidence %3D

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