5. The market shares in 2012 of four (4) television companies, A, B, C and D are listed below. A survey was carried out in 2017 on 200 television buyers and the distribution of buyers to A, B, C and D are also listed in the last column. Company ABCD Market share in 2012 0.40 0.32 0.24 0.04 Number of buyer in 2017 70 60 54 16 (a) Specify the competing hypotheses to test whether the market shares have changed since 2012. (b) Calculate the value of the test statistics. [6 marks] [10 marks] (c) Use a = 0.05 to determine if the market shares have changed since 2012. [9 marks]