A computer manufacturing company has sent a mail survey to 2,800 of its randomly selected customers that have purchased a new laptop.The survey asked the customers whether or not they were satisfied with the computer.800 customers responded to the survey.640 customers indicated that they were satisfied,while 160 customers indicated they were not satisfied with their new computer.Construct a 96 percent confidence interval estimate of the true proportion of customers satisfied with their new computer.
A) [.771,.829]
B) [.788,.812]
C) [.775,.825]
D) [.785,.816]

Question

Quizplus · Accepted Answer

The correct answer is A. The confidence interval is calculated as: 0.64 +/- 1.96 * sqrt(0.64 * 0.36 / 2800) = 0.64 +/- 0.029 = [0.611, 0.669].

A Computer Manufacturing Company Has Sent a Mail Survey to 2,800