II.C.3. Hypothesis Testing III: Related/Paired Sample Means

Below are some links to supplement our class discussion on this topic:

• J Brophy's lecture notes
  
• Lesson on two sample parametric tests from the Psych Department of UWSP
• J Wasson's lesson on the dependent t-test

Here are links to help you in performing paired samples t-test

• online
• you will first be prompted to key in your sample size (number of pairs of scores)
  
• using SPSS
• here's a movie tutorial
• making sense of the output
  
• using MS-Excel

It's important to remember that two related or paired samples t-test has assumptions that we might be violating. Visit Northwestern University Medical School's StatGuide and find out:

• ways to check if your data violated two related samples t-test assumptions
  
• ways to examine two related samples t-test results to detect assumption violations
• alternatives if assumptions were violated
  
  

Below is a ppt presentation from the publishers of our book:

Click HERE if you wish to view the slides with notes (in pdf format).

Here are some studies that made use of paired samples t-test:

• Chaparro, Shaikh & Baker (2005). Reading online text with a poor layout: Is performance worse?
  
• Imanishi, Kuriyama, Shigemori, Watanabe, Aihara, Kita, Sawai, Nakajima, Yoshida, Kunisawa, Kawase & Fukui (2007). Anxiolytic effect of aromatherapy massage in patients with breast cancer.
  
• McKinstry, Cameron, Elton & Riley (2004). Leniency and halo effects in marking undergraduate short research projects.

Review the lesson using the the following materials from Wadsworth Cengage:

• flashcard
• tutorial quiz