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11.6 A random sample from a population has n = 30, Ex; = 120, Ex, = 8310. (a) Calculate unbiased estimates of the population mean,

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11.6 A random sample from a population has n = 30, Ex; = 120, Ex, = 8310. (a) Calculate unbiased estimates of the population mean, the popu- lation variance, and the variance of the sample mean. (b) Provide an approximate 95% confidence interval for the popu- lation mean

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