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Confidence interval for the proportion of incoming freshman

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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.

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?

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.

Reference no: EM132858003

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