The t Tests Review. Which test? Specify the appropriate t test. –College students are randomly assigned to undergo either behavioral therapy or Gestalt.

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Presentation transcript:

The t Tests Review

Which test? Specify the appropriate t test. –College students are randomly assigned to undergo either behavioral therapy or Gestalt therapy. After 20 therapeutic sessions, each student earns a score on a mental health questionnaire. –According to the U.S. Department of Health and Human Services, the average 16-year-old male can do 23 push-ups. A physical education instructor finds that in his school district, 30 randomly selected 16-year- old males can do an average of 28 push-ups. –One hundred college freshmen are randomly assigned to sophomore roommates having either similar or dissimilar vocational goals. At the end of their freshman year, the GPAs of these 100 freshmen are to be analyzed on the basis of the previous distinction. –A counseling program randomly selects 15 new mothers and measures their levels of depression, provides them with a counseling program, and measures their levels of depression again.

Comparison of paired to independent sample t-test

Paired samples t-test Perform paired samples t-test Calculate 95% CI

Independent samples t-test Perform independent samples t-test Calculate 95% CI

Question Why is the paired samples t-test significant? –The difference is the same

Group Practice

Final Exam Study Guide will be posted this afternoon Homework answers will be posted Thursday afternoon Make sure that you can calculate following –One sample t-test –Paired samples t-test –Independent samples t-test Make sure you can interpret the output for each.