Problem 7 Problem 7a At a 2 % level of significance, conduct a two-tailed test of hypothesis comparing the equality of two population means defined as follows. The first population mean relates to the mean of those values of Variable 6 that have the attribute represented by the "1" code for Variable 1. The second population mean relates to the mean of those values of Variable 6 that have the attribute represented by the "2" code for Variable 1. Use the pooled variance option when conducting this test. In your answer make sure that you show HO and Ha, sketch the sampling distribution showing the critical value(s) and the rejection region. Use your calculator to make all the required computations and also state the decision and conclusion in the context of your survey. Show all your work Problem 7b What assumptions did you make in conducting the test in Problem 7a above. Identify ALL key assumptions and fully explain. [4 marks]