5. MBB Problem 11.16: John Witty, research analyst for the Wisconsin Department of Education, has begun work on a study examining the performance of charter schools in the state. Dr. Witty is particularly concerned about the relatively high dropout rates at these schools. Last year, the dropout rate for the state’s charter schools averaged 15.1%. Dr. Witty believes that the rate has improved this year, but he does not have the data for the entire population of schools at this time. Accordingly, he collects data on dropout rates (expressed as the percentage of students who dropped out during the school year) for a random sample of 75 charter schools. Based on the data provided, what should Dr. Witty conclude? (Note: The data set for this problem is posted on Blackboard.)
6. MBB Problem 12.6: Bernie Belfry, the coordinator for Habitat for Humanity, wants to know the percentage of the population living in substandard housing. Belfry wants to be 99% certain that he is within 10 percentage points of the population percentage. How large a sample does Belfry need?
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