Hi, I just want to know if I got the correct answer on this assignment and if not what is the answer. thank you

l7 H mathxlcom Cl Til ' ET . Econ 2310: Business Statistics 991 Online Mory Abdoul Kader Karamoko ' | 4/15/18 3:51 PM Chapter 8 RGVieW Quiz SubmitQuiz __ O Radon is a colorless and odorless radioactive gas that can accumulate in residential homes. High levels of exposure can lead to health problems. Radon levels are measured in units of picocuries per liter (pCi / L). The recommended radon level is less than 4 pCi / L. A housing development has 108 residential homes. The homeowners association would like to estimate the average radon level in the development. Because it would be too expensive to measure every home, a random sample of 25 homes was selected to be tested. and the average radon level was found to be 1.4 pCi / L. Assume from past studies the population standard deviation of radon levels in homes is 0.5 pCi / L. Complete parts a and b below. a. Construct a 90% condence interval to estimate the average radon level in the housing development. The 90% condence interval to estimate the average radon level is ( 1.24 pCi I L, 1.56 pCi / L) . (Round to two decimal places as needed.) b. Does it appear the average radon level is below the recommendation? 0 A. No, because 4 pCi/ L is contained in the condence interval. 0 B. No, because some of the values in the condence interval are greater than 4 pCi I L. O c. Yes. because 4 pCi / L is contained in the condence inmrval. D. Yes, because all the values in the condence interval are less than 4 pCi / L. Click to select your answer(s). @ E3