MA215 W5P

***DUE IN 8 HRS***

For these project assignments throughout the course you will need to reference the data in the ROI Excel spreadheet. Download it here.

Using the ROI data set:

1. For each of the 2 majors consider the ‘School Type’ column.  Construct a 95% confidence interval for the proportion of the schools that are ‘Private’.  
2. For each of the 2 majors, construct a 99% confidence interval for the mean of the column ‘Annual % ROI’.
3. In a highlighted box, discuss the following.  How do these confidence intervals provide information about the which is the better major in terms of Annual ROI?  Why is it important to know the proportion of schools that are private?  What factors differ in public and private schools that could influence ROI?    Is a 99% confidence interval a guarantee that the ROI will be in the interval? Why or why not?   

NO PLAGIARISM!!!!!!!!!!!!!!!!!