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The average salary for a sample of 61 CFA charterholders with 10 years experience is $200,000, and the sample standard deviation is $80,000. Assume the population is normally distributed. Which of the following is a 99% confidence interval for the population mean salary of CFA charterholders with 10 years of experience? A. $172,754 to $227,246. B. $172,514 to $227,486. C. $160,000 to $240,000. |