Example 1 used measured performance IQ scores for three different blood lead levels. If we use the same three categories of blood lead levels with measured verbal IQ scores, we get the accompanying Minitab display. Using a 0.05 significance level, test the claim that the three categories of blood lead level have the same mean verbal IQ score. Does exposure to lead appear to have an effect on verbal IQ scores? Use analysis of variance for the indicated test.

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MINITAB Sourc DF LEAD Error 118 21441 182 Total 120 21584 ss MS 2 142 71 0.39 0. 677