1. If the probability of a disease is .34 without treatment and .22 with treatment then what is the
(a) absolute risk reduction
(b) relative risk reduction
(c) Odds ratio
(d)
Number needed totreat

2.
When is it meaningful to compute the proportional differnce between means?

3. The mean for an experimental group is 12, the mean for the control group were 8, the MSE from the ANOVA is 16, and N, the number of observatiions is 20, compute g and d.

4. Two experiments investigated the same variables but one of the experiment had subject who difered greatly from each other wherease the the subjects in the other experiment were relatively homogeneous. Which experiment would likely have the larger value of g?

5.
Why is ω^{2} preferable to η^{2}?

6. What is the difference between η^{2} and partial η^{2}?

The following questions are from the Teacher Ratings case study.