HTHSCI 2S03 Lecture Notes - Lecture 5: Confidence Interval, Fad Diet, Null Hypothesis

• School: McMaster University
• Department: Health Sciences
• Course: HTHSCI 2S03
• Professor: Mc Gillion Michael

Document Summary

Independent t test is appropriate for studies with: 2 groups (intervention vs control, 2 treatments). The difference in means is the difference between the oral ondansteron group and the placebo group mean. The se of the difference requires us to account for the sd of both the oral ondansteron group and placebo group. Now we need to compare the test statistic to the critical value of t to determine if the test statistic is statistically significant t = 3. 07. Critical value of t = -1. 984, 1. 984. How do you know: yes, because t = 3. 07 exceeds the critical value of t = 1. 984. Still comparing the means of two groups, however the observations are not independent. For each observation in the first group there is a corresponding observation in the second group: they are paired observations of the same participants before and after.