22 Mar Generate a research question that could be answered by performing an ANCOVA test on the given data. Create a set of hypotheses (alternative and null) for your test. Using th
- Download the appropriate file from Student Resources > Module 5 Homework – Module 5 File 1.
- Generate a research question that could be answered by performing an ANCOVA test on the given data.
- Create a set of hypotheses (alternative and null) for your test.
- Using the data in the file, perform an appropriate ANCOVA test. Save your output file and post it in this discussion.
- In addition, post your research question, your hypotheses for your test, and your conclusion regarding rejecting or not rejecting the null hypothesis based on your test, as well as some analysis regarding the practical significance of the results. This initial posting should be completed by Wednesday of Residency Week at 11:59 PM EST/EDT.
USING SPSS: ONE-WAY ANALYSIS OF COVARIANCE (ANCOVA)
1. TESTING THE HOMOGENEITY-OF-REGRESSION (SLOPES) ASSUMPTION Before we get started – we must first conduct a test of the homogeneity-of- regression (slopes) assumption. To conduct this test, follow these steps:
1. Click Analyze, click General Linear Model, and then click Univariate
2. Click the dependent variable, then click � to move it to the Dependent Variable box
3. Click the independent variable, then click � to move it to the Fixed Factor(s) box
4. Click the covariate, then click � to move it to the Covariate(s) box
5 Click Model
6 Click Custom under Specify Model
7. Click the independent variable under Factors & Covariates and click � to make it appear in the Model box
8. Click the covariate under Factors & Covariates and click � to make it appear in the Model box
9. Holding down the Ctrl key, click the independent variable (IV) and the covariate (Cov) in the Factors & Covariates box. Check to see that the default option Interaction is specified in the drop-down menu in the Build Term(s) box. If it is not, select it
10. Click � and the IV*Cov should now appear in the Model box
11. Click Continue. This will bring you back to the Univariate screen
12. Click OK
SPSS STEPS FOR ANCOVA PAGE 2
2. CONDUCTING THE ONE-WAY ANCOVA
1. Click Analyze, click General Linear Model, and then click Univariate
2. Click Reset
If you have not exited SPSS – the prior commands will still be shown. As a precaution for avoiding possible errors – click the reset key and begin the procedure from the initial starting point
3. Click the dependent variable, then click � to move it to the Dependent Variable box
4. Click the independent variable, then click � to move it to the Fixed Factor(s) box
5. Click the covariate, then click � to move it to the Covariate(s) box
6. Click on Options
7. In the Factor(s) and Factor Interactions box, click the independent variable
This will provide the adjusted (Estimated Marginal) means that will be used later (if needed) in post hoc procedures
8. Click � to move it to the Display Means for box
9. Select Descriptive statistics in the Display box
10. Select Homogeneity tests in the Display box
11. Click Continue
12. This will bring you back to the Univariate screen…
13. Click Plots
14. Click the independent variable, then click � to move it to the Horizontal Axis: box
15. Click Add
16. Click Continue
17. This will bring you back to the Univariate screen – click OK
3. CONDUCTING (POST HOC) PAIRWISE COMPARISONS
Open the ANCOVA Pairwise Comparisons Syntax from the course website
Once the syntax file is open…
1. Highlight the entire syntax
2. Click Run
3. Click Selection
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