I collected data for my study to compare with the published norms of two other studies. All three groups are from different populations (based on occupation). I will be using a two-sample independent t-test to compare population A with B, then another t-test to compare population A with C.
Unfortunately, I do not have access to each individual participants' scores for populations B and C, and it does not seem possible to obtain the data (authors have not been responding to email requests).
Is it still acceptable for journal publications to conduct a two-sample independent t-test without doing a Levene's test for equality of variance, simply using the mean, standard deviation, and sample size?