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A survey found that out of 200 workers, 168 said they were interrupted three or more times by phone messages, faxes, etc.

A. Find the 90% confidence interval for the population proportion of workers who get interrupted three or more times.

B. What sample size is required to estimate the proportion to within 2% of the population proportion, with 99% confidence, if a previous study gave an estimate of 80%?

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