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Given a sample size of 25, standard deviation of 2.9 and sample average of 21.92, we could be 95% confident that a population mean is

Given a sample size of 25, standard deviation of 2.9 and sample average of 21.92, we could be 95% confident that a population mean is between _____ and _____.

a) 20.72 and 23.12

b) 20.30 and 23.54

c) 20.93 and 22.91

d) 30 and 50

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