Statistical Inference Concerning Two Populations

Consider the following competing hypotheses and accompanying sample data drawn independently from normal distribution population. Ho; (mu)1-(mu)2=0 Ha; (mu)1-(mu)2=/(not equal to)0 X bar 1= 57, X bar 2=63 standard deviation 1= 11.5, SD 2=25.3 sorry, standard deviation 1= 11.5, SD 2=15.2 n1=20, n2=20 A. using the p-value approach, test whether the population means differ at the 5% significant level B. repeat the hypothesis test using the critical value approach That's all.. I'm really waiting for your help :"