Before we conduct any statistical analysis, we should do some data exploration. First, let's see if there is a difference in average accidents for days with a speed limit versus days without one. Create a table named accidents, with two columns and two rows. The two columns should be "limit" and "accidents mean" There should be one row for whether there was a speed limit ('yes') and not ('no'), and each row should encode the average accidents depending on whether there was a speed limit imposed