Module 14 HW - BMRT 21004 Module 14 HW(20 Points 4 Pages HW Problem 36(5 pts The EPA releases figures on urban air soot in selected cities For St Louis

Module 14 HW - BMRT 21004 Module 14 HW(20 Points 4 Pages HW...

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BMRT 21004 Module 14 HW (20 Points) 4 Pages HW Problem 36. (5 pts) The EPA releases figures on urban air soot in selected cities. For St. Louis, the agency claims the average number of micrograms per cubic meter of air is 82. After a couple of years trying to reduce this figure, St. Louis officials hire an environmental firm which takes 32 random samples of air over a period of time. This results in a sample mean of 78.125 micrograms of soot per cubic meter of air with a sample standard deviation of 9.1838 micrograms. At the .01 level of significance, has St. Louis been successful in reducing air soot in their city? List and clearly label all eight steps. ´ X ¿ s n ¿ ´ X ¿ s n ¿ = Z = 78.125 - 82 9.1838 32 = -2.3868
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