Problem 5 At a 5 % 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 4 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 4 that have the attribute represented by the "2" code for Variable 1. Do NOT 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. It is assumed that you are using your calculator for all computations leading up to and including the test statistic. Show all your work. [10 marks]