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My DevoreStat9 9 E 037 6.8/34 points | Previous Answers 3. Hexavalent chromium has been identified as an inhalation carcinogen and an air toxin of concern in a number of different locales. An article gave the accompanying data on both indoor and outdoor concentration (nanograms/m2) for a sample of houses selected from a certain region. House 8 9 5 6 2 3 4 Indoor 0.04 0.05 0.06 0.09 0.09 0.09 0.10 0.11 0.12 Outdoor 0.26 0.65 0.44 0.51 0.94 0.32 0.46 0.81 0.83 House 10 1112 13 14 15 16 17 Indoor 0.12 0.14 0.14 0.15 0.15 0.15 0.15 0.16 Outdoor 0.25 0.29 0.29 1.52 0.63 0.26 0.18 0.99 House 18 19 20 21 22 23 24 25 Indoor 0.17 0.19 0.19 0.20 0.20 0.22 0.23 0.25 Outdoor 1.56 0.87 0.49 0.09 0.51 0.85 0.46 1.21 House 26 27 28 29 30 31 32 33 Indoor 0.25 0.26 0.31 0.36 0.37 0.42 0.51 0.59 Outdoor 0.45 0.24 0.34 1.23 0.67 0.73 0.96 0.33 (a) Calculate a confidence interval for the population mean difference between indoor and outdoor concentrations using a confidence level of 95%. (Round your answers to two decimal places.) μǐndoor-t,outdoor, (nanograms/m2) Interpret the interval. We can 95% be confident that the true average concentration of hexavalent chromium indoors exceeds the true average concentration outdoors by an amount outside the interval ⓔ we can be 95% confident that the true average concentration of hexavalent chromium outdoors exceeds the true average concentration indoors by the absolute value of an amount within the interval. We can 95% be confident that the true average concentration of hexavalent chromium indoors exceeds the true average concentration outdoors by the absolute value of an amount within the interval. o we can 95% be confident that the true average concentration of hexavalent chromium outdoors exceeds the true average concentration indoors by an amount outside the interval O We cannot draw a conclusion from the given information. (b) If a 34th house were to be randomly selected from the population, between what values would you predict the difference in concentrations to lie? (Round your answers to two decimal places.) (nanograms/m3) You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help?tTalik to a Tutor

Answer 1

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