A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 150 students and finds that 84 of them are receiving financial aid. what is the width of a 90% confidence interval for the true proportion of students who receive financial aid.

Select one:

a.0.133

b.0.067

c.0.159

d.0.104