The 10 scores for a random sample of subjects with low lead H n x 5 levels in their blood and another random sample of subjects with high lead levels in their blood were collected. The Low Lead Level p1 79 9136514 1566567 statistics are summarized in the accompanying table. Assume '5' High Lead Level \"2 22 87-39873 879522 that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) to (c) below. The test statistic is . (Round to two decimal places as needed.) The P-value is . (Round to three decimal places as needed.) State the conclusion for the test. ' 2' A. Reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead levels have higher IQ scores. ' z B. Reject the null hypothesis. There is sufficient evidence to support the claim that subjects with low lead levels have higher 10 scores. ' ':- C. Fail to reject the null hypothesis. There is sufcient evidence to support the claim that subjects with low lead levels have higher IQ scores. " ':- D. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that subjects with low lead level have higher IQ scores. b. Construct a confidence interval appropriate for the hypothesis test in part (a).