Please help me with this 2 questions. 14. The negative effects of ambient air pollution on chil-dren's lung function has been well established, but lessresearch is available about the impact of indoor air pol-lution. The authors of "Indoor Air Pollution and LungFunction Growth Among Children in Four ChineseCities" (Indoor Air, 2012: 3-11) investigated the rela-tionship between indoor air-pollution metrics and lungfunction growth among children ages 6-13 years livingin four Chinese cities. For each subject in the study, theauthors measured an important lung-capacity indexknown as FEV,, the forced volume (in ml) of air that isexhaled in 1 second. Higher FEV, values are associatedwith greater lung capacity. Among the children in thestudy, 514 came from households that used coal forcooking or heating or both. Their FEV, mean was 1427with a standard deviation of 325. (A complex statisticalprocedure was used to show that burning coal had a clearnegative effect on mean FEV, levels.)a. Calculate and interpret a 95% (two-sided) confi-dence interval for true average FEV, level in thepopulation of all children from which the sample wasselected. Does it appear that the parameter of interesthas been accurately estimated?b. Suppose the investigators had made a rough guess of320 for the value of s before collecting data. Whatsample size would be necessary to obtain an intervalwidth of 50 ml for a confidence level of 95%?

Name: Please help me with this 2 questions. 14. The negative effects of ambi
Uploaded: 2024-03-20T07:07:37.000Z
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Description: Please help me with this 2 questions. 14. The negative effects of ambient air pollution on chil-dren's lung function has been well established, but lessresearch is available about the impact of indoor air pol-lution. The authors of "Indoor Air Pollut