Pls help to select correct option. a. Why is definitive knowledge of the effects of air pollution on human health difficult to obtain? (Check all that apply.)O Variations in conditions that cause unexpected or random shocks to air quality-so-called "natural experiments"-cannot be adequately controlled.O Economic shocks that alter ambient pollution levels and so might enable "natural experiments" are too infrequent toprovide enough data to reach meaningful conclusions.O While scientists have found correlations between air pollution and various health conditions, potential confoundingfactors make cause and effect difficult to determine.O Controlled experiments in which people are randomly assigned to different groups, exposed to differing levels of airpollution, are ethically problematic.b. Which of the following would constitute a "natural experiment" of the sort that the author argues could provideinformation about the effects of air pollution on human health?O Scientists track the health of residents of Lipton City, where a coal-fired power plant closes in the same month that themayor introduces a diet and fitness program in which nearly all Lipton City residents participate.O Researchers expose half of a group of undergraduates to a chemical compound linked to a respiratory illness and half tonothing at all and compare the health outcomes of the two groups.O Epidemiologists observe that the incidence of asthma is higher in Brazil than in the U.S.While a group of health researchers track the disease incidence of residents of Walrika, the city's bus fleet switches fromgas-powered to electricity-powered vehicles, decreasing air pollution.

Answer of Question no. a is Option B Economic shocks that alter ambient pollution levels and…

a. Why is definitive knowledge of the effects of air pollution on human health difficult to obtain? (Check all that apply.) O Variations in conditions that cause unexpected or random shocks to air quality-so-called "natural experiments"- cannot be adequately controlled. O Economic shocks that alter ambient pollution levels and so might enable "natural experiments" are too infrequent to provide enough data to reach meaningful conclusions. While scientists have found correlations between air pollution and various health conditions, potential confounding factors make cause and effect difficult to determine. OControlled experiments in which people are randomly assigned to different groups, exposed to differing levels of air pollution, are ethically problematic.

a. Why is definitive knowledge of the effects of air pollution on human health difficult to obtain? (Check all that apply.) O Variations in conditions that cause unexpected or random shocks to air quality-so-called "natural experiments"- cannot be adequately controlled. O Economic shocks that alter ambient pollution levels and so might enable "natural experiments" are too infrequent to provide enough data to reach meaningful conclusions. While scientists have found correlations between air pollution and various health conditions, potential confounding factors make cause and effect difficult to determine. OControlled experiments in which people are randomly assigned to different groups, exposed to differing levels of air pollution, are ethically problematic.

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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