A survey reported that 70% of those responding to a national survey of college freshmen were interested in taking summer courses. Using the sample size of 49, calculate a 95% confidence interval for the proportion of college students who are interested in taking summer courses.
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Paul wants to know how difficult it is to reach an employee of USC Office during 12-1pm. She has no idea about the proportion of calls to the USC office that were reached by the caller (proportion is unknown). With 95% level of confidence and 3% error (E), how many calls she should include in order to get answer to her question?
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During the last semester, 60 students of USC took the Basic Statistics course. Twelve of these students received more than 80 for the final exam. At 99% level of confidence, estimate the percentage of all students at USC who received more than 80 for the final exam of the Basic Statistics course during the last 10 years.
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