Wawanesa Mutual Insurance Company wanted to estimate the percentage of drivers who changed tapes or CDs while driving. A random sample of 850 drivers resulted in 544 who changed tapes or CDs while driving (based on data from Prevention magazine).
a. Find the point estimate of the percentage of all drivers who change tapes or CDs while driving.
b. Find a 90% interval estimate of the percentage of all drivers who change tapes or CDs while driving.