Lead and Full IQ Scores 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 the full IQ scores, we get the accompanying XLSTAT display. (The data are listed in Data Set 5 of Appendix: Data Sets.) Using a 0.05 significance level, test the claim that the three categories of blood lead level have the same mean full IQ score. Does it appear that exposure to lead has an effect on full IQ scores?

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XLSTAT Analysis of variance: Source DF Sum of squares Model 2 938.365 Mean squares 469.183 Error 118 24035.635 203.692 Corrected Total 120 24974.000 F Pr> F 2.303 0.104