Having trouble on this one.

In 2009 Noodles & Company introduced spaghetti and meatballs to its menu. Before putting it on the menu, it performed taste tests to determine the best-tasting spaghetti sauce. In a paired comparison, 25 tasters were asked to rate their satisfaction with two different sauces on a scale of 1-10, with 10 being the highest. Assume equal population variances. The mean difference in ratings was d = 0.35136 with a standard deviation of s/ = 1.90850. Use a = 0.05 (a) Choose the appropriate hypotheses for a two-tailed test. Assume /, is the average difference in the taste of the two sauces. O Ho: Hd = 0 versus H1: Hd