Need some help with the below
Prior to the introduction of hard shoulder running on a stretch of the M1, the long term mean accident rate was 6 fatalities/year. In the first year of the hard shoulder running scheme 7 fatalities were observed at the same stretch of motorway. The authorities are concerned this suggests an increase in the underlying mean accident rate. Carry out a formal test to assess whether this is the case, clearly stating any assumptions made.
Thanks a lot for any help