Refer to Exercise 14.1. After running the pilot study, the researchers conduct a study involving 100 students. Twenty- five students were randomly assigned to each of the four instructional conditions. The data are given here.
a. Conduct an analysis of variance, and summarize your results in an AOV table.
b. Test the research hypothesis that there is a difference in the effectiveness means of the methods of instruction. Use α = .05.
c. Apply a multiple- comparison procedure to determine pairwise differences in the three instructional methods. Use α = .05.
d. Was there significant evidence that all three methods of instruction produced higher mean reasoning scores than the mean reasoning score for the control?