A quality control engineer wants to compare production process of parts manufactured by three different companies, He samples a total of 270 parts from the three companies and the results are in the following table:
Company A Company B Company C
Defective
15 19 10
Non-defective
70 80 85
Use alpha=5%.
Ho:_____________
Ha:______________
Test Statistic:__________________________
P Value:_______________________________
Conclusion_____________________________
Based upon the results of the sample, can the quality control engineer conclude that part quality and manufacturer are independent?