A Psychologist Has Designed a New Intelligence Test

Multiple Choice

A psychologist has designed a new intelligence test.Historically,time to complete the old test was normally distributed with a standard deviation of 5 minutes.A sample of 50 new test taking times yielded an average time of 118 minutes.The 99% confidence interval for the average test taking time is _____.

A) [116.18,119.82]
B) [116.36,119.64]
C) [116.61,119.39]
D) [115.67,120.33]
E) [115.82,120.18]