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Find a confidence interval for assuming that each sample is from a normal population. (Round the value of t to 3 decimal places and your

Find a confidence interval for assuming that each sample is from a normal population. (Round the value of t to 3 decimal places and your final answers to 2 decimal places.) (a) xx = 24, s = 3, n = 7, 90 percent confidence.

(b) xx = 42, s = 6, n = 18, 99 percentconfidence.

(c) xx = 119, s = 14, n = 28, 95percent confidence.

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