In a comparison of the proportion of defectives produced by

In a comparison of the proportion of defectives produced by 4 different machines, researchers obtained

the following data. Machine A had 20 defectives in 200 items, B had 16 in 120 items, C had 10 in 140

items, and D had 7 in 160 items. Does the quality of the items produced appear to be the same for all

machines? Let alpha=.05

Include:

Hypothesis

Rejection Region

Failed to reject or reject null hypothesis

Conclusion

Solution