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A) For a sample size of 121, what is the standard error of the mean? B) What is the probability that the mean price for

A) For a sample size of 121, what is the standard error of the mean? B) What is the probability that the mean price for a sample of 121 federal income tax returns is within $16 of the population mean? C) If the sample size reduces to 100, what will the results on part B change

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