Need to know how to use your Texas Instruments graphing calculator for your college math or statistics class? You're in luck... watch this video tutorial to see how to test a population mean with a TI-83 graphic calculator.

Hypothesis test, single population mean, sigma unknown.

Please note, this example is NOT in your TI booklet

The CDE academic program gives a placement test with a mean score of 8. The Comp R Us Corp. has designed a preparation course, which the company claims will increase test scores. A random sample of 128 new students yielded a mean of 8.7 with a standard deviation of 2.3. Comp R Us says the data is normally distributed. At the 95% level of significance, test the company's claim that their course increases placement exams scores.

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