12. An independent-measures research study was used to compare two treatment conditions with n  12 participants in each treatment. The first treatment had a mean of M  55 with a variance of s 2  8, and the second treatment had M  52 and s 2  4. Do these data indicate a significant difference between the two treatments? Use a two-tailed test with  .05.

(Note: Because the two samples are the same size,