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9. To compare the amount of money students spent on textbooks in the Fall semester between two universities, independent random samples were chosen and revealed the following sample information: University 1 University 2 (Sample 1) (Sample 2) Sample Sizeznl- 50 40 Sample Mean: it $260 $250 Assume that the population standard deviations of students' spending on textbooks are known, i.e. 0'1 = $20 and 0'2 = $23. Let #1 =average spending on textbooks of students in University l [12 =average spending on textbooks of students in University 2 Develop and interpret a 95% condence interval estimate of the difference in the average spending on textbooks between the two universities