10-12. Consider the hypothesis test against Ho : 1 = 12 against H1 : u1 # u2. Suppose that sample sizes are and that and my = 15 and that and n2 = 15, that #1 = 4.7 and $2 = 7.8, and that $1 = 4 and $1 = 6.25. Assume that of = of and that the data are drawn from normal distributions. Use a = 0.05