Advance Biostats SPSS (Two-Way ANOVA) Use Tukey

Part 4

Step-by-Step Guide Assignment Problem 3.4

2-Way ANOVA

Problem 4. Conduct two-way ANOVA with interaction and post hoc analysis (as appropriate) using Tukey to correct for multiple comparisons. Provide relevant SPSS output.

Step 1. In the Practice_Week03_dataset.sav, go to Analyze ( General linear model (Univariate. There is only one dependent variable (Steps per month [EXERCISE]), so this is basically a univariate model.

Step 2. In the Univariate window, transfer Steps per month [EXERCISE] to the Dependent Variable box. Transfer Education level [EDUC] and Sex [SEX] to the Fixed Factor(s) box. Click Post Hoc.

Step 3. In Univariate: Post Hoc… window, transfer both EDUC and SEX to the Post Hoc Tests for box. Check Tukey. Click Continue.

Step 4. Click Options.

Step 5. Transfer EDUC and SEX to the Display Means for box. Since we are interested in the interaction between Education level and sex, also transfer EDUC*SEX to the Display Means for box. Although we have already completed Descriptive Statistics and Homogeneity tests, check them here for reference. Click Continue. Click OK

SPSS Output

Tests of Between-Subjects Effects
Dependent Variable: Steps per month
Source	Type III Sum of Squares	df	Mean Square	F	Sig.
Corrected Model	5955549373.489a	5	1191109874.698	4.211	.002
Intercept	44707311147.288	1	44707311147.288	158.038	.000
EDUC	4092792467.648	2	2046396233.824	7.234	.001
SEX	1602183746.129	1	1602183746.129	5.664	.019
EDUC * SEX	37044447.218	2	18522223.609	.065	.937
Error	26591552884.511	94	282888860.474
Total	104212533874.000	100
Corrected Total	32547102258.000	99
a. R Squared = .183 (Adjusted R Squared = .140)

Multiple Comparisons
Dependent Variable: Steps per month Tukey HSD
(I) Education level	(J) Education level	Mean Difference (I-J)	Std. Error	Sig.	95% Confidence Interval
					Lower Bound	Upper Bound
No or some high school	High school diploma	-6644.59	5177.451	.408	-18974.18	5685.01
	College Degree	-16153.45*	4797.716	.003	-27578.74	-4728.16
High school diploma	No or some high school	6644.59	5177.451	.408	-5685.01	18974.18
	College Degree	-9508.86*	3803.022	.037	-18565.38	-452.34
College Degree	No or some high school	16153.45*	4797.716	.003	4728.16	27578.74
	High school diploma	9508.86*	3803.022	.037	452.34	18565.38
Based on observed means. The error term is Mean Square(Error) = 282888860.474.
*. The mean difference is significant at the .05 level.

Step 6. Export your SPSS output to Word and save it in your Week 3 assignment folder.