Find the critical value and testing for two independent samples
A paired difference experiment produced following results:
n_{0} = 45, x_{1} = 155, X_{2} = 157, x_{d} = -2, s_{d} = 55,
a) Establish the rejection region for the hypothesis Ho : mean D= 0 if H_{a}: mean D > 0. Use a = 0.01. z>__________
b) Conduct a paired difference test described above. The test statistic is?