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7. Cathy wants to open a bridal salon. She wants to estimate the average price of wedding dresses sold in her city. She wants to

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7. Cathy wants to open a bridal salon. She wants to estimate the average price of wedding dresses sold in her city. She wants to be accurate 95% of the time and she has the standard deviation from a previous market study of $1,500. She wants to be within $250/dress. How big a sample does she need to draw to do her research

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