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The store studies the difference between the mean daily sales of two new stores. It is...

The store studies the difference between the mean daily sales of two new stores. It is known that the population standard deviations of daily sales of the two new stores are $500 and $480. If they want to produce a point estimate of the difference between the two population means with error not more than $100 with 95% confidence, determine the required sample size when sample sizes are identical.

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