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A random sample of 16 tax returns submitted to the IRS revealed a mean taxpayer refund of $425. Based on historical IRS figures, the population

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A random sample of 16 tax returns submitted to the IRS revealed a mean taxpayer refund of $425. Based on historical IRS figures, the population standard deviation was assumed to be $960. Assuming that the population is normal, what is the 95% confidence interval for the population mean taxpayer refund? Reference Equations O a. 425 + 394.80 b.425 470.40 OC. 425 + 117.60 O d. 425 + 511.44

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