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# 10 - An industrial plant claims to discharge no more than...

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Unformatted text preview: An industrial plant claims to discharge no more than lllﬂﬂ gallons of wastewater per hour, on the average. into a neighboring lake. An environmental action group decides to monitor the plant, in case this limit is being exceeded. A random sample offour hours is selected over a period of a week. The observations are “1'32, 26-65, 2813, 23114. a.Findthestandarderror. ﬂ se=|E| {Roundtotwo decimalplacesasneeded.) h. To testHﬂ: u= lllﬂﬂ vs. Ha: u:- lDIllD, ﬁnd the test statistic. Usethe answer from part (a) forthe standard error. t= |:| {Round to two decimalplaces as needed.) 1:. Choose the P—value. {31.11. 11.1125 05. 11.575 01:. 11.11511 OD. 11.11151 Considering a signiﬁcance level ofﬂJllS, is the null hypothesis plausible? DA. Yes, the data show it unlikely that the plant discharges no more than 1000 gallons of wastewater per hour on average. {:31 E. No, the data show it likely that the plant discharges no more than 1110!] gallons of wastewater per hour on average. QC. No, the data shows it unliker that that plant discharges no more than lﬂllﬂ gallons of wastewater per hour on average. C} D. Yes, the data shows it likely that that plant discharges no more than lﬂﬂﬂ gallons of wastewater per hour on average. d. Explain how your one sided analysis implicitly tests the broader null hypothesis that p 5 1111111. GA. It wouldbeunusualtogeta samplemean of lDﬂDifthepopulationmeanwere 2239.25. It would be even more unusualto get this sample mean ifthe population mean were less than lDﬂl}. GB. It wouldbeunusualtogeta samplemean of lﬂllﬂifthepopulationmeanwere 2239.25. It would be even more unusualto get this sample mean ifthe population mean were less than 2239.25. QC. It would be unusual to get a sample mean of2239.?5 ifthe population mean were lDIllD. It would be evenmore unusual to get this sample mean ifthe population mean were less than lllﬂﬂ. ...
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