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A fashion designer wants to know how many new dresses women buy each year. Assume a...

A fashion designer wants to know how many new dresses women buy each year. Assume a previous study found the variance to be 4. She thinks the mean is 7 dresses per year. What is the minimum sample size required to ensure that the estimate has an error of at most 0.11 at the 90% level of confidence? Round your answer up to the next integer.

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