Critical values

The degrees of freedom in a two-sample t-test is n1+n2-2, or 15+14-2=27. Using a table of critical values for t and alpha = 0.05, determine whether your t-score of 1.29 is above or below the critical value for a test done with 27 df. If your observed t value is higher than the critical value then reject the null hypothesis of no difference. If it's less then do not reject the null. The test of independent means is, by nature, a two-sided test which is why you want to use the alpha=0.05 column rather than the 0.025 column. Here's a link to a critical value table.

http://www.ruf.rice.edu/~bioslabs/tools/stats/ttable.html