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?
A) The t test for independent samples
B) The t test for nonindependent samples
C) Analysis of difference scores
D) ANOVA

Question

Quizplus · Accepted Answer

Since there are two clearly defined groups (classroom instruction vs computer-based training program) and they were randomly assigned, the appropriate test of significance is the t test for independent samples. This test will allow Misha to determine if there is a statistically significant difference between the two groups in terms of typing ability after the six-week treatment. ANOVA would be used if there were more than two groups being compared, but in this case, there are only two. Analysis of difference scores is not appropriate in this case as Misha is interested in comparing the two groups directly, not just the difference between their pre- and post-treatment scores. The t test for nonindependent samples would be used if the same participants were included in both groups, but in this case, they are two distinct groups with no overlap.

Misha Is Comparing Different Types of Typing Instruction