02-14-2011 2 Sample Hypothesis Testing

# 02-14-2011 2 Sample Hypothesis Testing - 2/14/2011...

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2/14/2011 1 Lecture 7: February 14, 2011 Readings Two Sample Hypothesis Tests: Chapter 10, pages 390 401 Two scenarios relating to the test statistic: Assume unequal variances (We did this last Wednesday). Assume equal variances (We’ll do this today). Next class: Two Sample Hypothesis Tests: Paired Samples, pages 404 409 Homework 5 opened at 10:00 p.m. February 11: Page 401: Problem 10.2–Two sample test, assume unequal variances Homework 5 closes Tuesday, February 15, at 6:00 p.m. Unlimited tries until it closes! Feedback! Homework 6 opens at 11:00 p.m. February 14: Page 401: Problems 10.4 and 10.6–Two sample test, assume equal variances Homework 6 closes Thursday, February 17, at 6:00 p.m. Unlimited tries until it closes! Feedback! Non Connect Practice problems: Page 401: Problem 10.7–Two sample test, assume unequal variances Page 401: Problem 10. 5–Two sample test, assume equal variances Answers are in the back of the book. If you need help with these, see a TA during office hours. Go to Worked Out Problems on My Web Site New Worked Out Problems ( available Tuesday afternoon) Page 401: Problems 10.3–Two sample test, assume unequal variances Page 401: Problems 10.4–Two sample test, assume equal variances Steps Visual p value If you do not understand any part, ask in discussion. This will be the first item of business during discussion. Two Ways To Proceed Last class we assumed that the true variances for the two groups are unequal . This class we assume that the true variances for the two groups are equal .

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2/14/2011 2 Hypothesis Tests For Comparing Two Population Means Treat σ as not known and estimated by s (Text pp 392 401) Do fraternity people perform at a level that is academically lower than non fraternity people? A university administrator wants to test the null hypothesis that the mean GPA of fraternity members (F) and non fraternity members (N) is the same versus the alternative that the mean for F is less than the mean for N. (If the alternative upholds, serious corrective action is to be taken). To test the hypothesis (at the 0.05 level) she generates the following sample data: X F =2.03 s F =0.6 n F =40
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## This note was uploaded on 10/13/2011 for the course FINOPMGT 250 taught by Professor Kouzehkanani during the Spring '08 term at UMass (Amherst).

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02-14-2011 2 Sample Hypothesis Testing - 2/14/2011...

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