The analysis in Table 9–12 is from a hypothetical study comparing performance of children with communication disorders, their chronological age-matched peers, and their communication age-matched peers. The study had two independent variables: a group variable that was nonexperimental and a method variable that was experimental.
The information reported includes descriptive statistics for the three groups of children across the two methods. The inferential data analysis was a two-way analysis of variance (ANOVA) with group and method as the independent variables. First, examine the descriptive statistics.
What do you think might have happened in this study? You might consider entering the means in a spreadsheet and generating a bar graph or line graph. Second, examine the ANOVA table. What information in this table is important? Write out the statistical results in the style recommended by the American Psychological Association (2010).
Would you need to complete post hoc testing with these results? Explain.