The distribution center manager at Internet distributor CyberAuto Warehouse wants to find a confidence interval for the average time required for an associate to fill an order for shipment. A sample of 16 orders is taken and the mean time was found to be 8.5 minutes, with a standard deviation of 2.8 minutes. Compute 95 percent and 99 percent confidence intervals. Which one is larger? Explain why.

(a) T.INV.2T for t-value, 2-tailed distribution, 95% conf.					2.131
CONFIDENCE.T interval for Students t-distribution					1.4920
(b)
T.INV.2T for t-value, 2-tailed distribution, 99% conf.					2.947
CONFIDENCE.T interval for Students t-distribution					2.0627