Spss p value, which should I write, sig or sig bilateral? Write a signature (both sides), which is the meaning of t test. Sig in this table indicates the significance of homogeneity test of variance. Of course, it is best to look at the significance of variance homogeneity test. Theoretically, if sig >: 0.05, t-test can be continued, otherwise, it is not appropriate to directly test parameters including t-test.

Just look at sig (both sides) directly, and look at the lines with equal variance. The former is the probability of Pearson's two-sided test, so the former is chosen.

Please refer to the following criteria for specific selection of unilateral or bilateral:

A. If there are differences between the two populations, and there is the possibility that A is higher than B or B is higher than A, then choose two-sided test.

B. according to professional knowledge, there is only one possibility, and then one-sided inspection is chosen.

C. in the exploration of pre-experiments, bilateral tests are generally used.

D. when the researcher only cares about one possibility, choose one-sided test.