Short Answer

1. When is ANOVA used?
Ans: ANOVA is used when you want to compare means from more than two groups.
Learning Objective: 12-1: How do we test hypotheses about populations for three or more groups?
Cognitive Domain: Comprehension
Answer Location: More Than Two Independent Samples

2. What is the between-groups variance term?
Ans: The between-groups variance is based on the variation among the means of the samples.
Learning Objective: 12-4: How do between-groups and within-groups variance terms differ?
Cognitive Domain: Knowledge
Answer Location: Using Variance Instead of Mean Differences

3. What is the within-groups variance term?
Ans: The within-groups variance is based on the variation among the scores in each of the samples.
Learning Objective: 12-4: How do between-groups and within-groups variance terms differ?
Cognitive Domain: Knowledge
Answer Location: Using Variance Instead of Mean Differences