sample subjects medium lead levels in their study done with high lead levels. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population sta are equal. Complete parts (a) and (b) below. Click the icon to view the data table of IQ scores. a. Use a 0.01 significance level to test the claim that the mean IQ scores for subjects with medium lead levels is higher than the mean for subjects with high lead levels. 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. OA. Ho: H₁ H₂ H₁: Hy > H₂ C OC. Ho: H₁ H₂ H₁: Hy > H₂ OB. Ho: H₁ H₂ H₁ H₁ H₂ OD. Hoi Hy #2 H₁: Hy > H₂

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