More on ANOVA

Read this chapter and complete the questions at the end of each section. While these sections are optional, studying ANOVA may help you if you are interested in taking the Saylor Direct Credit exam for this course.

Within-Subjects ANOVA

Answers

  1. Trial, Dose, and Day. If different groups are used for each condition, then the variable is a between-subjects variable; if the same subjects are tested in each condition, then the variable is a within-subjects variable.

  2. For between-subjects variables, differences among subjects are error. For within-subjects variables, each subject's performance in one condition is compared to his or her performance in another condition. Therefore, overall differences are not a source of error.

  3. The assumption has to do with correlations among scores, which is not applicable in between-subjects designs since subjects have only one score.

  4. Violating the assumption increases the Type I error rate, sometimes substantially.

  5. 0.049