PSYCH STATS CHAP 9

• hypothesis-testing procedure for studies

  with three or more groups.


  analysis of variance (ANOVA)
• estimate of the

  variance of the population of individuals

  based on the variation among the scores

  in each of the actual groups studied.

  within-groups estimate of the

  population variance
• estimate of the

  variance of the population of individuals

  based on the variation among the means

  of the groups studied.

  between-groups estimate of the

  population variance
• ratio of the between-groups

  population variance estimate to the

  within-groups population variance

  estimate.

  F Ratio
• mathematically defined

  curve that is the comparison distribution

  used in an analysis of variance.

  F distribution
• table of cutoff scores on the

  F distribution.

  F table
• within-groups

  estimate of the population variance.

  S2 Within or MS Within
• overall mean of all

  the scores, regardless of what group they

  are in; when group sizes are equal, mean

  of the group means.


  grand mean (GM)
• between-groups

  estimate of the population variance.

  S2 Between or MS Between
• the between-groups degrees of

  freedom. It is also called the

  numerator degrees of freedom.
• within-groups degrees of freedom, also called the

  denominator degrees of freedom.
• comparison in which the particular means to be

  compared were decided in advance.

  planned contrast
• way of understanding

  the analysis of variance as a division

  of the deviation of each score from

  the overall mean into two parts

  structural model
• chart showing the major elements in figuring

  an analysis of variance using the

  structural model approach.

  analysis of variance table