Two-group t-test

Since this is review material, read or skim as needed.

Material from EDUR 8131 Introduction to Educational Statistics

• Read: Notes 5b Independent Samples t-test
• Reporting t-test Results in APA Style: Two-independent samples t-test (Word doc)
• Examples of Published t-test Results:
  • Hallam, Price, & Katsarou 2006, see Tables 1 and II, p. 115 (lacks *p<.05, t value)
  • Goodman, Hans, & Bernstein 2005, see Table 1, p. 555
• Critical t-values table: t-tables.pdf  

Instructional Videos 

• Watch and Read: Instructional Videos and Related Materials
  • Excel File: Two-group t-test and F-max Test
  • Sections 1 and 2: Overview, Purpose, Steps in Hypothesis Testing 
  • Sections 3 and 4: Hypotheses and Decision Rules  
  • Section 5: t-test with Equal Variances -- Formula, Standard Error, and df   
  • Section 6: Finding Critical Values for t-test  
  • Section 7: Example 1 t-test with Equal Variances -- Formulas   
  • Section 7: Example 1 t-test with Equal Variances -- SPSS 
  • Section 7: Example 1 t-test with Equal Variances -- Excel  
  • Section 7: Example 2 t-test with Equal Variances -- Formulas and SPSS  (SPSS starts at about 5:45 in video)
  • Section 7: Example 2 t-test with Equal Variances -- Excel  
  • *Section 8: Heterogeneity of Variances  
  • Section 9: Assessing Homogeneity of Variance -- Levene's Test (SPSS)  
  • Section 9: Assessing Homogeneity of Variance -- F-max Test    
  • Section 9: Assessing Homogeneity of Variance -- F-max Test with Excel  
  • Section 10: t-test with Unequal Variances -- Formula, Standard Error, and df   
  • Section 11: Example 1 t-test with Unequal Variances -- SPSS and Excel
  • Section 11: Example 2 t-test with Unequal Variances -- SPSS and Excel 
  • Section 12: Confidence Intervals - Example 1  (SPSS) 
  • Section 12: Confidence Intervals - Example 2  (SPSS) 
  • *Section 13: Equal vs. Unequal t-test - Comparison of Results
  • Section 14: APA Style Presentation - t-test with Equal Variances 
  • Section 14: APA Style Presentation - t-test with Unequal Variances 
  • Section 14: APA Style Presentation - Multiple t-tests with same Group and Text Format