Road safety is a high priority for all levels of government. Suppose a survey was conducted by the automobile associations in four Australian states to determine motorists? views of the condition of their local roads. Each association randomly selected 10 motorists who drive an average of 1000km a week on local roads. Each selected motorist was asked to rate their local roads on a scale from 0 to 100 to indicate how safe they feel driving on their particular roads. A score of 0 indicates feeling completely unsafe and a score of 100 indicates feeling perfectly safe. The scores are shown below. Test this randomised block design to determine whether there is a significant difference between the views on the safety levels of local roads in the four states. Use ? = 0.05.

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Motorist State 1 State 2 State 3 State 4 70 1 35 55 75 45 60 65 85 3 50 55 60 75 20 75 45 90 70 45 55 65 30 55 40 75 55 80 60 60 65 70 65 75 9. 70 60 55 85 10 45 65 45 70