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8.3.19 Construct a 90% confidence interval to estimate the population mean when x 56 and s 12.5 for the sample sizes below a)
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23. 5 = 56, S=12.5, BI ? 90% I score of 90% cb = 1.645 margin of error. z.s. 31-645-1206. - 20.5625 C1; lower limit = 56 – 20

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