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8-72. When we need to estimate the population mean, and the population standard deviation is unknown, we are hit with a double whammy when it

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8-72. When we need to estimate the population mean, and the population standard deviation is unknown, we are hit with a "double whammy" when it comes to the margin of error. Explain what the "double whammy" is and why it occurs. (Hint: Consider the sources of variation in the margin of error.)

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