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A semiconductor company wants to estimate the fraction of defective computer chips it produces. Suppose that a random sample of 900 chips has 18 defective chips.
a. Find a point estimate of ?.
b. Find a 95% confidence interval for the proportion ? of defective chips
c. Find a one-sided 95% lower confidence interval for the proportion ? of defective chips.
d. How large a sample should be taken in order to be confident with probability 95% that the margin of error to estimate the fraction ? of defective computer chips is 0.025?
The production department wants to explore the relationship between the number of employees who assemble a subassembly and the number produced. The complete set of paired observations follows:
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