Recall that a random sample of 501 satellite radio subscribers was asked, “Do you have a satellite radio receiver in your car?” The survey found that 396 subscribers did, in fact, have a satellite receiver in their car.
a. From the sample, calculate an estimate of the true proportion of satellite radio subscribers who have a satellite radio receiver in their car.
b. Form a 90% confidence interval for the estimate, part a.
c. Give a practical interpretation of the interval, part b.