In a simple random sample of 219 students at a college, 73 reported that they have at least $1000 of credit card debt. What is the 99% confidence interval for the percent of all the students at that college who have at least $1000 in credit card debt?
(Points : 3)
(25.0, 41.6)

(27.5, 39.1)

(30.1, 36.5)

(31.0, 35.6)

Question

In a simple random sample of 219 students at a college, 73 reported that they have at least $1000 of credit card debt. What is the 99% confidence interval for the percent of all the students at that college who have at least $1000 in credit card debt?
(Points : 3)
       (25.0, 41.6)

       (27.5, 39.1)

       (30.1, 36.5)

       (31.0, 35.6)

anonymous · Answer

A. 
use your calculator, go to STAT, TESTS, 1-proportion z interval.
x: 73
n:219
C: .99
(.251, .415)
Turn those into a percent which gives you answer A