point across town. The number of hours required for delivery was recorded in each case and summarised as follows:   SS(Total) = 150.97   SST = 5.98   SSB = 122.49   a Can we conclude at the 1% significance level that there are differences in delivery times among the three couriers?   b Comment on the suitability of the experimental design in this problem.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Self-correcting exercise. In recent years, lack of confidence in the postal service has led many companies to send all their postage by private courier. A large company is in the process of selecting one of three possible couriers to act as its sole delivery method. To help in making the decision, an experiment was performed whereby letters were sent using each of the three couriers at 10 different times of the day to a delivery point across town. The number of hours required for delivery was recorded in each case and summarised as follows:

 

SS(Total) = 150.97

 

SST = 5.98

 

SSB = 122.49

 

a Can we conclude at the 1% significance level that there are differences in delivery times among the three couriers?

 

b Comment on the suitability of the experimental design in this problem.

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