(To be done by computer.) The chapter talks at some length about the best way to analyze data from a randomized pretest-posttest design. To see how various analytic strategies might compare to one another in a realistic situation, let’s return to the data shown in Table 9.7. Recall that Table 9.9 presented ANCOVA results for these data. a. Because groups were randomly assigned here, it might seem acceptable to ignore pretest scores in comparing the groups on the posttest. Test to see whether there is a significant difference between groups on the pretest. b. Based on your answer to part a, you might decide to proceed to conduct an ANOVA on posttest scores, ignoring pretest scores. How do your results compare to the ANCOVA results In particular, does the ANOVA yield a statistically significant result at the .05 level? c. Another possible approach might be to analyze gain scores. Conduct an ANOVA on gain scores. How do your results compare to the ANCOVA results In particular, does the ANOVA yield a statistically significant result at the .05 level? d. A colleague suggests that your pattern of results implies that ANCOVA appeared superior because it exaggerated the differences between the groups. How would you respond to this colleague’s statement? e. What do your results comparing the three different approaches suggest about the relative merits of ANCOVA, ANOVA on posttest only, and ANOVA on gain scores for analyzing data from randomized pretest-posttest designs?
We Write Essays for Students
Tell us about your assignment and we will find the best writer for your paper
Get Help Now!
PLACE THIS ORDER OR A SIMILAR ORDER WITH LITE ESSAYS TODAY AND GET AN AMAZING DISCOUNT
The post What do your results comparing the three different approaches suggest about the relative merits of ANCOVA appeared first on Cheapest Academic Custom Papers.
Welcome to originalessaywriters.com, our friendly and experienced essay writers are available 24/7 to complete all your assignments. We offer high-quality academic essays written from scratch to guarantee top grades to all students. All our papers are 100% plagiarism-free and come with a plagiarism report, upon request
Tell Us “Write My Essay for Me” and Relax! You will get an original essay well before your submission deadline.
