4. (12 points) A common mixed design is when there is a pretest and a posttest score obtained subjects who were randomly assigned to various levels of a between subjects factor A. Remember the pretest measure is taken then a treatment is applied and then a post-test measure is taken. Describe 4 methods of analyzing this data and describe the advantages and disadvantages of each.

1. Analysis of covariance-

b. Analysis of gain scores-

c. Analysis of post scores only-

d. Using the mixed design analysis.