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A 95% confidence interval for a population mean is determined to be 100 to 120. For the same date, if the confidence coefficient is reduced

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A 95% confidence interval for a population mean is determined to be 100 to 120. For the same date, if the confidence coefficient is reduced to .90, the confidence interval for a a. becomes narrower. b. becomes wider. c. does not change. d. becomes 100.1 to 120.1

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