1 a sample of 100 elements produced a mean of 48 and a, Ask an Expert

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1) A sample of 100 elements produced a mean of 48 and a standard deviation of 8. The 99% confidence interval for the population mean is:

2) Suppose the population standard deviation = 8. The appropriate sample size for estimating the true population mean within 2 units with 95% confidence level is approximately

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