question archive 1) 400 incoming freshman were asked of their intended major, and 95 of them said business or some business related field
1) 400 incoming freshman were asked of their intended major, and 95 of them said business or some business related field
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1) 400 incoming freshman were asked of their intended major, and 95 of them said business or some business related field. Find a 98% confidence interval for the proportion of incoming freshman who will major in business or a business-related field.
Answer: ( , )
2) You're tasked with determining the proportion of college students who smoke regularly, but you must collect enough data so that a 90% confidence interval is no more than 0.15 wide. How many students should you poll?
3) In a sample of 64 senior college students, the standard deviation for age was 2.3 years. Compute a 99% confidence interval for the true standard deviation of the population of college seniors.
Answer: ( , )
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