I am interesting in learning if there is difference between the control and the treatment group in a paper I am reading. Unfortunately the paper only compares the respective conditions to a 0 effect size. The paper does not have open data or report standard deviations.
The relevent results reported in the paper are:
A one-sample t test on the recommended IAT measure indicated that the mean D score for the participants in the control condition (M = −.19 was significantly less than zero, t(29) = −2.50, p = .019. The estimated Cohen’s d for this effect was .46. In contrast, a one-sample t test indicated that the mean D score for the participants in the perspective taking condition (M = −.13) was not significantly less than zero, t(29) = −1.61, p = .119.
Is it possible to compare the two effect sizes to learn about the difference between the two conditions instead?