Exercise 1. Purchase Rating a) To show that the television commercial was effective in improving the mean purchase potential rating, identifying Ho and Ha for testing the difference between two mean. b) Identify the appropriate t-test. Explain your selection. c) Conduct the test using an = .05. d) Interpret your results in the context of this problem. Data : Individual. After. Before 1 6 5 2 6 4 3 7 7 4 4 3 5 3 5 6 9 8 7 7 5 8 6 6 Explain steps in spss