IBM SPSS t-Test assignment
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cf_assessment_3_step_by_step_instructions.docx
IBM SPSS Step-by-Step Guide: t Tests
Note: This guide is an example of creating t test output in SPSS with the grades.sav file. The variables shown in this guide do not correspond with the actual variables assigned in Assessment 3. Carefully follow the Assessment 3 instructions for a list of assigned variables. Screen shots were created with SPSS 21.0.
Assumptions of t Tests
To complete Section 2 of the DAA for Assessment 3, you will generate SPSS output for a histogram, descriptive statistics, and the Shapiro-Wilk test. (Levene test output will appear in Section 4 of the DAA.) Refer to the Assessment 3 instructions for a list of assigned variables. The example variables lowup and final are shown below.
Step 1. Open grades.sav in SPSS.
Step 2. Generate SPSS output for the Shapiro-Wilk test of normality. (Refer to previous step-by-step guides for generating histogram output and descriptives output for the Assessment 3 variables.)
On the Analyze menu, point to Descriptive Statistics and click Explore…
In the Explore dialog box, move the assigned Assessment 3 variables into the Dependent List box. The final variable is used as an example below.
Click the Plots… button.
In the Explore: Plots dialog box, select the Normality plots with tests option.
Click Continue and then OK.
Step 3. Copy the Tests of Normality table and paste it into Section 2 of the DAA Template. Interpret the output.
Note: The Levene test is also generated as part of the SPSS t-test output for Section 4 (discussed next). You do not have to provide the Levene test output twice. You can report and interpret it in Section 2 and then provide the actual output in Section 4.
Reporting of t Tests
DAA Section 4 involves generating the t-test output and interpreting it. The example variables of lowup (lower division = 1; upper division = 2) and final are shown below.
Step 1. Generate SPSS output for the t test.
On the Analyze menu, point to Compare Means and click Independent-Samples T Test…
Step 2. In the Independent-Samples T Test dialog box:
First, move the Assessment 3 dependent variable into the Test Variable(s) box.
Second, move the Assessment 3 assignment variable into the Grouping Variable box. Notice the (? ?) after the variable. The values of the independent variable are assigned in the next step.
Third, click the Define Groups… button.
Fourth, in the Define Groups dialog box, assign the corresponding values: Group 1 = 1, Group 2 = 2.
Fifth, click Continue and then OK.
Step 3. Copy the output for the independent samples test and paste it into Section 4 of the DAA Template. Then interpret it as described in the Assessment 3 assignment instructions.
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