Table 8 : Descriptive Statistics of Dependent Variable: Posttest Scores feedback type personality type Mean Std. Deviation N CR impulsive 16.9417 .66851 30 reflective 17.3552 .75864 31 Total 17.1518 .73974 61 EEC impulsive 17.2500 .64087 29 reflective 17.2460 .61990 30 Total 17.2480 .62483 59 Total impulsive 17.0932 .66776 59 reflective 17.3015 .69031 61 Total 17.1991 .68449 120 9: Levene's Test of Equality of Error Variancesa Dependent Variable:posttest scores F df1 df2 Sig. 3.222 3 116 .025 Tests the null hypothesis that the error variance of the dependent variable is equal across groups. As table 9 demonstrates, the homogeneity of variances assumption was violated (F=3.22, p=.025<.05). However, the researcher decided to proceed with the analysis on the grounds that the size of the two groups was reasonably similar (larger/smaller=61/39=1.04 <1.5) and based on the fact that analysis of variance is reasonably robust to violations of this assumption provided that the size of the groups is similar (Stevens, 1996, p.249).
Table 8 : Descriptive Statistics of Dependent Variable: Posttest Scores feedback type personality type Mean Std. Deviation N CR impulsive 16.9417 .66851 30 reflective 17.3552 .75864 31 Total 17.1518 .73974 61 EEC impulsive 17.2500 .64087 29 reflective 17.2460 .61990 30 Total 17.2480 .62483 59 Total impulsive 17.0932 .66776 59 reflective 17.3015 .69031 61 Total 17.1991 .68449 120 9: Levene's Test of Equality of Error Variancesa Dependent Variable:posttest scores F df1 df2 Sig. 3.222 3 116 .025 Tests the null hypothesis that the error variance of the dependent variable is equal across groups. As table 9 demonstrates, the homogeneity of variances assumption was violated (F=3.22, p=.025<.05). However, the researcher decided to proceed with the analysis on the grounds that the size of the two groups was reasonably similar (larger/smaller=61/39=1.04 <1.5) and based on the fact that analysis of variance is reasonably robust to violations of this assumption provided that the size of the groups is similar (Stevens, 1996, p.249).
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