A logistics firm is trialling two different autonomous delivery drone systems, Model Alpha and Model Beta, to deliver packages along a standard 5 km suburban route.
The delivery times, in minutes, are recorded over a series of test flights. The summary statistics for the delivery times of each model are shown in the table below:
| Drone Model | Mean delivery time (minutes) | Standard deviation (minutes) |
|---|---|---|
| Model Alpha | 14.2 | 1.5 |
| Model Beta | 11.8 | 4.9 |
What do the mean and standard deviation values in the table suggest about the performance of Model Alpha compared to Model Beta? Justify your answer.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.