Mixeddesign ANOVA Five righthanded students and five lefthan

Mixed-design ANOVA

Five right-handed students and five left-handed students were randomly selected from the first grade at an elementary school. The reading performance of these students was measured on three occasions: (a) at the beginning of first grade; (b) at the start of second grade; and (c) at the start of third grade. The reason for the study is that a doctoral student suspects that lateral preference may influence a child

Solution

The cell sizes, means, and standard deviations for the repeated measure design are presented in Table 1. The main effect of preference is not significant (F[1,8] = .984, p = .350). However the differences between the three occasions are highly significant, F(2.16) = 53.647, p < .001.

  Table 1: Descriptive Statistics  

  preference  

  Mean  

  Std. Deviation  

  N  

  Grade 1  

  Left  

  22.80  

  4.604  

  5  

  right  

  25.80  

  1.924  

  5  

  Total  

  24.30  

  3.683  

  10  

  Grade 2  

  Left  

  26.40  

  5.595  

  5  

  right  

  29.80  

  4.025  

  5  

  Total  

  28.10  

  4.932  

  10  

  Grade 3  

  Left  

  31.00  

  6.245  

  5  

  right  

  32.80  

  3.633  

  5  

  Total  

  31.90  

  4.909  

  10