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 leve IQ scores O A. Ho: H 42 OB. Ho: H- P2 H H 2 Medium Lead Level D High Lead Level Xc. Họ: H S2 *D. Ho: H = H2 H > 2 72 96 92 n2 = 11 H: H 2 X2 = 89.003 85 84 97 83 92 The test statistic is 0.41. (Round to two decimal places as needed.) S2 = 9.752 The P-value is 0.343 (Round to three decimal places as needed.) State the conclusion for the test. 95 111 91 O A. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores. OB. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that subjects with medium lead levels have higher 1Q scores. Yc. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores. O D. Reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with medium lead levels have higher IQ scores. Print Done b. Construct a confidence interval suitable for testing the claim that the mean 1Q scores for subjects with medium lead levels is higher than the mean for subjects with high lea