Answer it
P1 a4 clean readings
4 marksYou mark it yourself against the marking points
A town council keeps hourly readings from an air-quality sensor outside a primary school. It wants to use them to train a model that predicts the level of fine dust (PM2.5) in the air. Part of the data is shown.
| Time | Temperature (°C) | PM2.5 (µg/m³) |
|---|---|---|
| 08:00 | 14.2 | 31 |
| 09:00 | 15.0 | |
| 10:00 | 15.8 | 35 |
| 10:00 | 15.8 | 35 |
| 11:00 | 160 | 36 |
| 12:00 | 16.9 | 34 |
(a) Identify two different data quality problems in the table. For each one, give the time of the row where it appears. [2]
(b) Suggest a treatment for the problem in the 11:00 row, and justify it. [2]
[4]