Single Sample t-test Hypothesis Test Part 2

Part 2 of the single-sample t-test hypothesis test. Question: What do you think it means to reject the null hypothesis in this situation? What does this mean regarding the effect of sleep deprivation on driving performance? I apologise for the use of the whiteboard. I was going to just show my screen and write the equations there, but my stylus is no longer working, and my mouse doesn't allow for legible writing. ;_;