What is the 99% confidence interval for the spending difference between men and women?

The local baseball team conducts a study to find the amount spent on refreshments at the ball park. Over the course of the season they gather simple random samples of75 men and 100 women. For men, the average expenditure was $20, with a standard deviation of $3. For women, it was $15, with a standard deviation of $2. What is the
99% confidence interval for the spending difference between men and women?

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