A logistics company operates distribution centres (DCs) in a region. In each quarter, every DC either delivered faster than it had in the previous quarter or delivered more slowly; none was unchanged. The table shows, for each quarter, how many DCs fell into each group and the average (arithmetic mean) number of hours per delivery those DCs saved or lost. Forty DCs were in operation in Q1 and forty-two in each later quarter.
| Quarter | DCs with
Faster Delivery | Avg. Hours
Saved | DCs with
Slower Delivery | Avg. Hours
Lost |
|---|
| Q1 | 12 | 0.8 | 28 | 1.2 |
| Q2 | 20 | 0.9 | 22 | 1.0 |
| Q3 | 18 | 0.6 | 24 | 1.1 |
| Q4 | 21 | 0.7 | 21 | 0.8 |
Define a quarter's net hours as the total hours saved by the faster DCs minus the total hours lost by the slower ones. For each of the following quarters, select Improved if that quarter's net hours figure is greater than the immediately preceding quarter's. Otherwise, select Did not improve.
