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Develop a 95% Confidence Interval

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Please help with the following problem.

Independent random samples taken on two university campuses revealed the following information concerning the average amount of money spent on textbooks during the fall semester.

Develop a 95% confidence interval for the difference in spending on textbooks between students at University A and University B.
University A University B
Sample 50 40
Average Purchase $280 $250
Standard Deviation $20 $23

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Problem: Independent random samples taken on two university campuses revealed the following information concerning the average amount of money spent on textbooks during the fall semester. Develop a 95% confidence interval for the difference in spending on textbooks between students at University A and University B.

Solution:
Independent random samples ...

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