Carpooling workers

Question 1 In a simple random sample of size 400 taken from over 500,000 workers, 21% of the sampled workers are in carpool. What is an approximate 95% confidence interval for the percent of carpooling workers in the population. Question 2 In a simple random sample of 500 students taken from a large university, 150 have undeclared majors. Construct an approximate 85% confidence interval for the percent of students at the university who have undeclared majors.

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