Elwin Osbourne, CIO at GFS, Inc., is studying employee use of GFS e-mail for non-business communications.A random sample of 200 e-mail messages was selected.Thirty of the messages were not business related.The 98% confidence interval for the population proportion is _________.
A)0.108 to 0.192
B)0.153 to 0.247
C)0.091 to 0.209
D)0.145 to 0.255
E)0.250 to 0.275

Question

Quizplus · Accepted Answer

The sample proportion is 30/200 = 0.15. Using the formula for a confidence interval for a proportion and a 98% confidence level, the interval is approximately 0.091 to 0.209.