This question is related to my question about the one-sited chi-square test. As an excuse: The advisor of my masters thesis told me that I should use a one-sited t-test. The answers that I just got for the chi-square-question kind of confused me and I would like to doublecheck.
I have two samples. My hypothesis is: Mean value of Sample A is larger then the mean value of sample B.
I use SPSS for the statistics. I use the "two sample t-Test for equality of means". SPSS only gives "sig. (2-tailed)". This is the p-value - correct? As far as I remember from my statistic lecture, SPSS conducts a two-sided T-Test. So I am allowded to divde the "sig. (2-tailed)-Value" by 2 to receive the 1-sided p-value?