The data to the right show the average retirement ages for a random sample of workers in Country A and a random sample of workers in Country B. Complete parts a and b. Country A Country B Sample mean 65.2 years 66.9 years Sample size 30 30 Population standard deviation 4.7 years 5.3 years a. Perform a hypothesis test using o = 0.05 to determine if the average retirement age in Country B is higher than it is in Country A. Let population 1 be the workers in Country A and population 2 be the workers in Country B. Identify the null and alternative hypotheses. Choose the correct answer below. OA. Ho: H1 - H2 >0 OB. Ho: H1 - H2 = 0 H 1 : H1 - 12 50 Hy: 14 - 12 # 0 O C. Ho: H1 - H2 50 OD. HO: H1 - H2 20 H1: H1 - H2 > 0 H1: 14 - 12