16.53 Response times for telephone repair calls.
A study examined the time required for the telephone company Verizon to respond to repair calls from its own customers and from customers of a CLEC, another phone company that pays Verizon to use its local lines. Here are the data, which are rounded to the nearest hour:
trepair
Verizon | |||||||||||
1 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 1 | 1 | 2 | 2 |
1 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 1 | 1 | 2 | 3 |
1 | 1 | 1 | 1 | 2 | 3 | 1 | 1 | 1 | 1 | 2 | 3 |
1 | 1 | 1 | 1 | 2 | 3 | 1 | 1 | 1 | 1 | 2 | 3 |
1 | 1 | 1 | 1 | 2 | 3 | 1 | 1 | 1 | 1 | 2 | 4 |
1 | 1 | 1 | 1 | 2 | 5 | 1 | 1 | 1 | 1 | 2 | 5 |
1 | 1 | 1 | 1 | 2 | 6 | 1 | 1 | 1 | 1 | 2 | 8 |
1 | 1 | 1 | 1 | 2 | 15 | 1 | 1 | 1 | 2 | 2 | |
CLEC | |||||||||||
1 | 1 | 5 | 5 | 5 | 1 | 5 | 5 | 5 | 5 |
16.53
(a) The CLEC customers generally have to wait longer than the Verizon customers for repairs. (b) The data are count data and far from normally distributed. , The CLEC customers have systematically higher repair wait times than the Verizon customers. (c) The CLEC group only has two values, 1 and 5. The Verizon group is strongly right skewed and has a large outlier.