Use a 0.05 significance level to test the claim that the mean IQ score of people with low lead levels is higher than the mean IQ score 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 Fill in the blanks to complete Step 1: The hypotheses: Ho MI - 12 = [ Select ] HIM1 - 12 [ Select ] [ Select ] where u] is the mean from the low lead level group and /2 is the mean from the high lead level group