Part D Within the investment department you manage stocks of car manu- facturers. Your initial thought is to buy the same amount of BMW, Audi, Mercedes and Porsche stocks. This, however, would only make sense if they all grew at the same rate. Therefore, you want to test whether they have mutually the same mean or whether they grow dif- ferently. You know that you cannot use any of the techniques from the previous questions because, in this problem, you deal with four different populations. Consequently, you choose to use the Analysis of Variance method (ANOVA) (see sheet called "Part D" in the excel file "Practical Test - Data Set). Using the ANOVA tables, test for whether the means between all stocks are equal or whether they statistically differ