Week 8: Analysis of Covariance (ANCOVA)
As an example, a statistics professor may wish to understand what teaching approach is most useful in imparting statistical knowledge (a topic about which many statistics professors are very interested). The professor may use a different instructional approach in three different classes to determine which produces higher mean outcome scores. Using a one-way ANOVA does not control for the confounding aspect of the level of statistical knowledge that a student had coming into the course. The professor can administer a pre-test at the beginning of the term and now control for previously acquired statistics knowledge when comparing means.
Learning Objectives
Students will:
Analyze ANCOVA in a dataset
Critique research studies that apply ANCOVA
Required Readings
Datasets
In this course, your instructor will provide you with one dataset (Guided Sample Dataset: Statistics Anxiety) that will be used in several of the tutorial videos. You are encouraged to reproduce the analyses performed in the video using this dataset so you can compare your answers and check your understanding of how to do each analysis in SPSS. You will also be provided with three large datasets for you to use in application of the statistics you’re learning each week. The Statistics Anxiety dataset is not for use in your weekly Assignments. Your instructor may also recommend using a different dataset from the ones we have provided here, which is fine. Your instructor will share these datasets in the Doc Sharingsection of the classroom and as an Announcement.
Required Media
Walden University, LLC. (Producer). (2017h). Introduction to analysis of covariance [Video file]. Baltimore, MD: Author.Note: The approximate length of this media piece is 2 minutes.Begin each week of the course by viewing the Weekly Introduction video, in which experienced statistics Instructors, Dr. Matt Jones and Dr. Annie Pezalla, provide context for new learning, explain statistical methods in easy-to-understand language, and describe the learning activities you will need to complete. Walden University, LLC. (Producer). (2017c). ANCOVA [Video file]. Baltimore, MD: Author.Note: The approximate length of this media piece is 7 minutes 15 seconds.This video provides step-by-step instructions that explain how to perform the statistical test required in Assignment 1.
Collaboration Labs are offered throughout the course as places of academic refuge, where you can ask questions, offer insights, and interact with the Instructor as they provide global feedback to the group based on trends, common problems, and common strengths in student posts.
Although not mandatory, this is an opportunity to interact and practice as you navigate the assignments, so you are highly encouraged to take part in this activity. Full participation in activities like these is a statistically significant predictor of success.
To participate in this Collaboration Lab:Week 8 Collaboration Lab
Earlier this week, you practiced using ANCOVA models with SPSS and, ideally, used the Collaboration Lab to ask, answer, and otherwise address any questions you had. In this Assignment, you apply what you learned to answer a social research question using ANCOVA. Hopefully you are not yet tired of comparing means!
Review the datasets provided.
Pay attention to the assumptions of this test, and ask, “Does it make sense to interpret the mean of this dependent variable?”
The Assignment
What is the null hypothesis for your question?
What dependent variable was used and how is it measured?
What is your covariate?
What is the answer to your research question?
What are the possible implications of social change?
Early in your Assignment, when you relate which dataset you analyzed, please include the mean of the following variables. If you are using the Afrobarometer Dataset, report the mean of Q1 (Age). If you are using the General Social Survey Dataset, report the mean of Age. If you are using the HS Long Survey Dataset, report the mean of X1SES. See pages 713 and 714 in your Warner textbook for an excellent APA-compliant write-up of an ANCOVA.
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