Chen Inc.wants to estimate the average processing time for 2000 current orders.You take a simple random sample of 40 orders, and determine the average processing time required for the orders in the sample is 6.5 hours, with a sample standard deviation of 1.6 hours.Build the 95% confidence interval estimate of average processing time for the population of 2000 orders.Show the upper bound for your interval.
A)7.00
B)6.47
C)6.61
D)7.49
E)6.53

Question

Quizplus · Accepted Answer

The correct answer is A.The upper bound for the 95% confidence interval is 6.5 + 1.96 * (1.6 / sqrt(40)) = 7.00.

Chen IncWants to Estimate the Average Processing Time for 2000 Current