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9.2 .1 2'T Questior Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in their blood. Also listed are statistics from a study done for a random sample of subjects with high lead levels. Assume that the two samples are independent simple random samples selected from normally di populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. a Click the icon to view the data table of IQ scores. a. Use a 0.01 signicance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with levels. What are the null and alternative hypotheses? Assume that population 1 consists of subjects with medium lead levels and population 2 consists of subje lead levels. A. H02p1=p2 .VB_ H02p1=p2 H11il17'i12 ' > C. H0: \"1 #112 0 IO Scores - > I12 The test statistic is El. (Round to two decimal places as ne Medium Lead Level 9-. High Lead Level Enter your answer in the answer box and then click Che 4 pans remaining