IQ and Lead Exposure Data Set 8 “IQ and Lead” in Appendix B lists full IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood. The statistics are summarized below. Use a 0.05 significance level to test the claim that IQ scores of people with low lead levels vary more than IQ scores of people with high lead levels.

Low Lead Level: n = 78, x = 92.88462, s = 15.34451 High Lead Level: n = 21, x = 86.90476, s = 8.988352