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3. A Subaru dealer wants to find out the age of their customers (for advertising purposes). They want the margin of error to be 1.5

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3. A Subaru dealer wants to find out the age of their customers (for advertising purposes). They want the margin of error to be 1.5 years. From a previous study, they estimate the population standard deviation to be 6 years. If they want a 95% confidence interval, how many people do they need to sample

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