Lots of people claim that having a pet helps lower their stress level. Use the following summary data to test the claim that there is a lower average stress level among pet owners (group 1) than among non-owners (group 2) at the .05 level of significance. X-bar = 16.25, X2-bar = 20.95, standard error = 1.24, n = 29, n = 25. (Run a directional/one-tailed test. Higher scores indicate greater stress level.)