Listed in the data table are it) scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done of it) scores for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. 00 not assume that the population standard deviations are equal. Complete parts (a) and (b) below. ' m Click the icon to view the data table of IQ scores. {E at hlgher than the mean 'Ol' SUDlECtS With high lead leVEIS. " What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subjects with high lead levels. A. H01 p15u2 l H021\" H2 Htillt>l12 H1:u1>p2 a" He'llt'z Hosil1=l12 H12u1>u2 H13l11l12 The test statistic is D. (Round to two decimal places as needed.)