Do drivers reduce excessive speed when they encounter police radar? Researchers studied the behavior of drivers on a rural interstate highway in Maryland where the speed limit was 55 miles per hour. They measured speed with an electronic device hidden in the pavement and only considered a vehicle speeding if it was 10 mph over the posted limit. During some time periods an electronic sign was set up so that drivers were aware of their speed when they drove by. At other times there was no sign set up. Here is the data for a given period of time. write an appropraite pair of hypothesis