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If the standard deviation, is known the z-distribution values may not be used to determine interval estimates for the population mean when a. n <

If the standard deviation, is known the z-distribution values may not be used to determine interval estimates for the population mean when a. n < 30. b. the distribution is skewed. c. n is big. d. n is small (< 30) and the distribution is not normal. e. the distribution is not normal

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