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A random sample of 440 in size is taken from a population with a mean of 6930 and unknown variance. The sample variance was found

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A random sample of 440 in size is taken from a population with a mean of 6930 and unknown variance. The sample variance was found out to be 420. (a) Find the point estimate of the population variance. A2 6 = (b) Find the mean of the sampling distribution of the sample mean. #27

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