Worksheet 4-1:

First enter your name in cell F1 on this worksheet.

A company makes frequent use of local courier services. They have tried three different courier services

(Courier 1, Courier 2, and Courier 3) and selected a courier service at random when a delivery was to be

made. For each service call, they determined and recorded the total time in minutes from when the

courier was contacted to when the courier completed delivery. The recorded results appear on

Worksheet 4-1.

Using a 0.01 significance level, is there sufficiently strong evidence of differences in the mean values of

time from contact to completed delivery for the three courier services?