Experiment 1: Is there some pattern? Are grid lines alone sufficient?

Are grid lines sufficient?
Experiment 1: Was adding grid lines to interarrival times plot sufficient?

Transcript

No, it's really a very, very hard just seeing those grid lines to see that this occurs, then this one occurs, then this one occurs, then this one occurs.  But by adding these lines, it was very, very, very obvious.  So something that we normally wouldn't do, which is connecting individual data points with straight lines, actually gave us more insight.