Question

In a simple random sample of 80 patients that go to a certain dentist, 9 patients had their teeth whitened. which interval is the 95% confidence interval for the percent of all the dentist's patients who had their teeth whitened?
(4.4, 18.2)
(8.4, 14.2)
(5.5, 17.1)
(7.8, 14.8)

Answer 1

The first one is the answer. Just took the test.