Suppose a random sample of 50 is drawn from a population whose standard deviation is unknown. If the sample mean is 70 and the sample standard deviation is 5, the 90% confidence interval to estimate the population mean is between O 69.01 and 70.99 O 69.34 and 70.65 68.81 and 71.19 O 69.52 and 70.99 O 69.32 and 70.68

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