Waiting times (in minutes) of customers at a bank where all customers enter a single waiting

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QUESTION:

Waiting times​ (in minutes) of customers at a bank where all customers enter a single waiting line and a bank where customers wait in individual lines at three different teller windows are listed below. Find the coefficient of variation for each of the two sets of​ data, then compare the variation.

Bank A​(single line): 6.5 6.6 6.7 6.8 7.0 7.2 7.3 7.7 7.7 7.7

Bank B​(individual lines): 4.1 5.5 5.7 6.2 6.7 7.6 7.6 8.5 9.4 9.8

The coefficient of variation for the waiting times at Bank A is _%.

(Round to two decimal places as​ needed)

The coefficient of variation for the waiting times at the Bank B is _​%.

​(Round to two decimal places as​ needed.)

Is there a difference in variation between the two data​ sets?

a. There is no significant difference in the variations.

b. The waiting times at Bank B have considerably less variation than the waiting times at Bank A.

c. The waiting times at Bank A have considerably less variation than the waiting times at Bank B.


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