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 Market Share in 2012 Number of buyer in 2017 A 0.4
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 Market Share in 2012 Number of buyer in 2017 A 0.4
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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 | Market Share in 2012 | Number of buyer in 2017 |
A | 0.4 | 70 |
B | 0.32 | 60 |
C | 0.24 | 54 |
D | 0.04 | 16 |
(a) Specify the competing hypotheses to test whether the market shares have changed since 2012.
(b) Calculate the value of the test statistics.
(c) Use ? = 0.05 to determine if the market shares have changed since 2012.
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