Question: College Tuition: Professors' Salaries How much has college tuition gone up? How much have professors' salaries gone up? The National Education Association's Almanac of Higher Education, published by the NEA, gave the following information.

1. A random sample of 12 East Coast colleges and universities (public and private) gave the following percentage tuition increases for a 2-year period:
   3.9 2.3 3.7 9.4 4.8 3.9
   6.7 6.6 4.6 4.3 3.1 3.1
   Use a calculator with mean and sample standard deviation keys to verify that x = 4.70% and s ~ 1.98%. Compute a 90% confidence interval for the population mean percentage tuition increase /n of all East Coast colleges and universities.
2. A random sample of 14 East Coast colleges and universities gave the following percentage increases in salaries for professors during the same 2-year period:

2.8 4.3 2.4 3.4 5.5 3.8 3.4
5.1 2.4 3.0 2.9 0.4 1.4 3.7

Use a calculator with mean and sample standard deviation keys to verify that x ~ 3.18% and s ~ 1.34%. Compute a 90% confidence interval for the population mean percentage salary increase of all East Coast college and university professors.

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