Five drivers each complete five trials using a computer reaction timer in each condition. During the conversation trials, each driver talks with a passenger. The two conditions are tested in a random order. The table shows the mean reaction time for each driver in each condition.
| Driver | Mean reaction time without conversation in s\text{s}s | Mean reaction time while talking with a passenger in s\text{s}s |
|---|---|---|
| P | 0.24 | 0.30 |
| Q | 0.28 | 0.33 |
| R | 0.25 | 0.29 |
| S | 0.32 | 0.31 |
| T | 0.26 | 0.34 |
| Mean for all drivers | 0.27 | 0.31 |
Evaluate the conclusion that talking with a passenger increases the reaction time of every driver.