An industrial safety engineer recorded the response times (in milliseconds) of critical safety valves during 50 automated test trials under two different maintenance protocols.
Table 3: Mean response times and standard deviations for two valve maintenance protocols
| Mean response time (ms) | Standard deviation (ms) | |
|---|---|---|
| Standard Scheduled Maintenance | 245.8 | 68.4 |
| Predictive AI-Driven Maintenance | 112.5 | 14.2 |
What do the mean and standard deviation values in Table 3 suggest about the effect of the maintenance protocol on the response times of the safety valves? 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.