(The Education Trust) publishes data on U. S. colleges and universities. Six-year graduation rates and student-related expenditures per full-time student for 2007 were reported for the seven primarily undergraduate public universities in California with enrollments between 10,000 and 20,000. Suppose that a 90% confidence interval for the prediction of student expenditures at a university with a graduation rate of 40% was (5,226, 8,620) (a) Determine the point estimate for the prediction of student expenditures at a university with a graduation rate of 40%.
(b) Calculate the margin of error.
(c) Calculate the standard error of the prediction of student expenditures at a university with a graduation rate of 40%. (Use a table or technology. Round your answer to one decimal place.)