Learning Objectives

  • Describe two types of research designs used when we select related samples.
  • Explain why difference scores are computed for the related samples t test.
  • Calculate the degrees of freedom for a related samples t test and locate critical values in the t table.
  • Identify the assumptions for the related samples t test.
  • Compute a related samples t test and interpret the results.
  • Compute effect size and proportion of variance for a related samples t test.
  • State three advantages for selecting related samples.
  • Summarize the results of a related samples t test in APA format.
  • Compute a related samples t test using SPSS.