Comparisons of Several Populations

  • Kristin E. Voelkl
  • Susan B. Gerber


In chapter 12, we demonstrated the use of t-tests for comparing the means of two populations (such as males and females). The analysis of variance (ANOVA) allows us to compare the means of a larger number of populations (i.e., two or more). Through the analysis of variance, variability among the group means is compared to the variability within the groups. If between-group variability is substantially greater than within-group variability, the means are declared to be significantly different. The ANOVA allows you to answer questions such as:
  • Is political affiliation (Democrat, Republican, Independent) related to the number of elections in which people vote?

  • Do three different techniques for memorizing words have different impacts on the mean number of words recalled?

  • Is annual movie income from movie sales related to the type of movie?


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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Kristin E. Voelkl
    • 1
  • Susan B. Gerber
    • 2
  1. 1.Research Institute on AddictionsBuffaloUSA
  2. 2.SUNY at BuffaloBuffaloUSA

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