Two semiconductor factories are being compared to see if there is a

Two semiconductor factories are being compared to see if there is a difference in the average defect rates of the chips they produce. In the first factory, 250 chips are sampled. In the second factory, 350 chips are sampled. The proportions of defective chips are 4.0% and 6.0%, respectively. 

 

Using a confidence level of 95%, which of the following statements is supported by the data?

 

A. There is not sufficient evidence to show a significant difference in the average defect rates of the two factories.

B. There is a significant difference in the average defect rates of the two factories.

C. The first factory’s average defect rate is lower than the second factory’s on 95 out of 100 days of operation.

D. None of the above 

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