APA Style Write-up - Kent State University
[Pages:1]Independent Samples t-test results in APA Style
2/25/05
In order to examine differences in weight gain between the control and IPT groups at the end of a psychotherapy trial, an independent samples t-test was conducted. Given a violation of Levene's test for homogeneity of variances, F(1,21)=4.83, p = .04, a t-test not assuming homogeneous variances was calculated. The results of this test indicated that there was a significant difference in weight observed between the two groups, t(16.43)=-3.22, p =.005. These results suggest that individuals in the IPT group (M = .32; SD = 1.79) lost less weight than individuals in the control group (M = -3.46; SD = 3.60). The size of this effect (d = -1.31), as indexed by Cohen's (1988) coefficient d was found to exceed the convention for a large effect size (d = .80.
Independent Samples Test
Levene's Test for Equality of Variances
t-test for Equality of Means
Change in weight at Equal variances assumed Post-Intervention Equal variances not assumed
F 4.826
Sig. .039
t -3.135 -3.222
df
Sig. (2-tailed) Mean Difference
21
.0050
-3.77652
16.428
.0052
-3.77652
Std. Error Difference
1.20453
1.17193
Note: this write-up was modified slightly after class. It was edited for grammatical errors and small content errors. Means and standard deviations were inserted as well.
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