Find the interval ?-z?/ ?n, ? + z?/ ?n within which 95 percent of the sample mea

Question

Find the interval ?-z?/ ?n, ? + z?/ ?n within which 95 percent of the sample means would be expected to fall, assuming that each sample is from a normal population. (a) ? = 206, ? = 15, n = 48. (Round your answers to 2 decimal places.) The 95% range is from _________ to ________ . (b) ? = 1,071, ? = 14, n = 11. (Round your answers to 2 decimal places.) The 95% range is from __________ to ______________ . (c) ? = 47, ? = 3, n = 21. (Round your answers to 3 decimal places.) The 95% range is from ___________ to ______________.

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