b) A stock analyst randomly selected five stocks in each of three industries and compiled the three-year rate of return for each stock. The analyst would like to know whether any of the industries has a different rate of return from the others. Manufacturing 10.6 15.5 17.1 5.7 19.5 Energy 12.2 13.9 6.4 11.2 18.8 Retailing 11.8 5.6 13.4 9.9 3.9 At 5% level of significance, test whether there is a significant difference in average return for each stock in the three industries. (10 marks) b) A stock analyst randomly selected five stocks in each of three industries and compiled the three-year rate of return for each stock. The analyst would like to know whether any of the industries has a different rate of return from the others. Manufacturing 10.6 15.5 17.1 5.7 19.5 Energy 12.2 13.9 6.4 11.2 18.8 Retailing 11.8 5.6 13.4 9.9 3.9 At 5% level of significance, test whether there is a significant difference in average return for each stock in the three industries. (10 marks)