Transport Research Laboratory, a UK-based global company, undertook a research to identify factors that contributed to the increasing number of road accidents. In its report titled “The effects of drivers’ speed on the frequency of road accidents,” it gathered the following data on the accident frequency (per link per year) and mean speed (miles/hour) in London.

a. Draw a scatter diagram for these data.
b. Is there a relationship between mean speed and accident frequency?
c. Do you think this relationship can be applied to regions outside London?

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Accident Frequency 0.75 1.25 1.5 2 2.5 3 Mean Speed (miles/hour) 20 25 28 30 32 35