Question: 9. A study was performed on the effect of time of work on quality of work in a certain plant. It was the practice in

9. A study was performed on the effect of time of work on quality of work in a certain plant. It was the practice in the plant for a crew to change shifts once a month. A study of three months of operations by one crew that remained intact for the entire period showed the numbers of defective and nondefective items produced. The data are given below (from Duncan, 1958). Do you conclude from these data that the time of work significantly affects the quality of the works? Use the 0.05 level of significance.

Justify your answer.

Shift Defective Nondefective 1 (8:00–4:00) 52 921 2 (4:00–12:00) 61 902 3 (12:00–8:00) 73 851

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