Data 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 the mean IQ score of people with low lead levels in their blood is lower than those with high lead levels in their blood. Let /1 represent low lead level. Low Lead Level: n = 23 = 89.90476 s = 11.988352 High Lead Level: n = 76 x = 89.89462 S = 13.34451 Determine the null and alternative hypotheses O Ho : H1 = 12 H1 : M1 / 12 Ho : H1 # #2 H1 : H1 > /2 O Ho : M1 = M2 H1 : M1