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Mathematics
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OpenStudy (anonymous):
In a study of how students pay for their college education, a random sample of 100 students was selected. (a) Suppose that 65 students in the survey took out a student loan for the semester. Find a 90% confidence interval for the proportion of all students with a loan that semester. (b) Using all available information, should we sample more or less in order to estimate the true proportion within .05 with 90% confidence?
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