Question: 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

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 Excel display. 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? Use analysis of variance for the indicated test.

EXCEL ANOVA Source of Variation SS Between Groups 938.3653 2 469.1827 2.303395 0.104395 3.07309 Within Groups df MS P-value F crit 035.63 118 203.6918 Total 24974 120

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