Question: 10. Do you think that this estimate is somewhat accurate? Why or why not? d. Using the results from part (b), estimate the probability that

10. Do you think that this estimate is somewhat accurate?

Why or why not?

d. Using the results from part (b), estimate the probability that the number of defects in a batch is exactly 9.

e. After examining the results from part (b), how much do the numbers of defects vary? Are the numbers of defects in batches somewhat predictable, or do they vary by large amounts?

f. A quality control engineer claims that a new manufacturing process reduces the numbers of defects, and a test of the new process results in a batch having no defects. Based on the results from part (b), does the absence of defects in a batch appear to suggest that the new method is better, or could random chance be a reasonable explanation for the absence

> of defective cell phones? Explain.

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