Misha is comparing different types of typing instruction. In one group, he used a classroom-based instructional method, and for the other group, he used a computer-based training program. After a six-week treatment, he assessed differences in their typing ability. Of the following, which is the appropriate test of significance for Misha to use assuming random assignment and no pretreatment differences?
◦ Analysis of difference scores
◦ The t test for independent samples
◦ ANOVA
◦ The t test for nonindependent samples