Answer to Question #229987 in Statistics and Probability for SLYYYY

Question

7. A survey among the workers in a large manufacturing company was taken, in order to find out from which company the workers had purchased their mobile phones, and to find out whether the choice of mobile phone company was related to the type of worker. The results are shown in the table below. Company of mobile phone Type of workers Pink Green Blue Yellow Total Executive 15 6 6 6 33 Middle management 21 25 8 8 62 Secretarial 33 36 11 5 85 Labourer 40 29 12 8 89 Total 109 96 37 27 269 Is there evidence, at 5% level, that the choice of Phone Company is independent of the type of worker?