[Old Professer]

Considering that there were over 900,000 traffic accidents in Japan in each of both years the two month running average would be around 150,000; now, 217/150,000 is a little better than 423/150,000 but the overall change isn't statistically meaningful.

[Raycpa]

Before it was illegal: Officer asks did you use cell phone during accident ? Answer _____

After it was illegal: Officer asks did you use cell phone ? Answer ______