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QUESTION 5 A grocery chain wants to know if the three types of advertisements affect the mean sales differently. They used each type of advertisement at four different randomly selected stores for a month and measured the sales (RM '000) for each store at the end of the month. The results are as follow. Descriptives Advertisement Statistic Mean 11.5000 Type 1 Std. Deviation 3.41565 Sum 46.00 Mean 10.0000 Sales Type 2 Std. Deviation 3.26599 Sum 40.00 Mean 7.5000 Type 3 Std. Deviation 2.51661 Sum 30.00 ANOVA Sales Sum of Squares df Mean Square F Sig. Between Groups A 2 16.333 D 235 Within Groups 86.000 9 C Total B 11 a) Using the sum of squares between groups formula, calculate the value of A. (3 marks) b) Compute the values of B, C and D. (3 marks) c) State the null and alternative hypothesis for the above study. (1 mark)d) Using the p-value method, is there any evidence to support that the types of advertisements affect the mean sales? Test at a=0.01