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12. IQ and Lead Exposure Data Set 7 "IQ and Lead" in Appendix B lists full IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood. The statistics are summarized below. a. Use a 0.05 significance level to test the claim that the mean IQ score of people with low blood lead levels is higher than the mean IQ score of people with high blood lead levels. b. Construct a confidence interval appropriate for the hypothesis test in part (a). c. Does exposure to lead appear to have an effect on IQ scores? Low Blood Lead Level: n = 78, x = 92.88462, s = 15.34451 High Blood Lead Level: n = 21, x = 86.90476, s= 8.988352

12. IQ and Lead Exposure Data Set 7 "IQ and Lead" in Appendix B lists full IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood. The statistics are summarized below. a. Use a 0.05 significance level to test the claim that the mean IQ score of people with low blood lead levels is higher than the mean IQ score of people with high blood lead levels. b. Construct a confidence interval appropriate for the hypothesis test in part (a). c. Does exposure to lead appear to have an effect on IQ scores? Low Blood Lead Level: n = 78, x = 92.88462, s = 15.34451 High Blood Lead Level: n = 21, x = 86.90476, s= 8.988352

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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12. IQ and Lead Exposure Data Set 7 "IQ and Lead" in Appendix B lists full IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood. The statistics are summarized below. a. Use a 0.05 significance level to test the claim that the mean IQ score of people with low blood lead levels is higher than the mean IQ score of people with high blood lead levels. b. Construct a confidence interval appropriate for the hypothesis test in part (a). c. Does exposure to lead appear to have an effect on IQ scores? Low Blood Lead Level: n = 78,7 = 92.88462, s = 15.34451 High Blood Lead Level: n = 21, x = 86.90476, s= 8.988352
Transcribed Image Text:12. IQ and Lead Exposure Data Set 7 "IQ and Lead" in Appendix B lists full IQ scores for a random sample of subjects with low lead levels in their blood and another random sample of subjects with high lead levels in their blood. The statistics are summarized below. a. Use a 0.05 significance level to test the claim that the mean IQ score of people with low blood lead levels is higher than the mean IQ score of people with high blood lead levels. b. Construct a confidence interval appropriate for the hypothesis test in part (a). c. Does exposure to lead appear to have an effect on IQ scores? Low Blood Lead Level: n = 78,7 = 92.88462, s = 15.34451 High Blood Lead Level: n = 21, x = 86.90476, s= 8.988352
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