Mathematical Statistics with Applications, 7 edition ISM_Chapter01F

《Mathematical Statistics with Applications, 7 edition ISM_Chapter01F》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Chapter1:WhatisStatistics?1.1a.Population:alltiresmanufacturedbythecompanyforthespecificyear.Objective:toestimatetheproportionoftireswithunsafetread.b.Population:alladultresidentsoftheparticularstate.Objective:toestimatetheproportionwhofavoraunicamerallegislature.c.Population:timesuntilrecur

2、renceforallpeoplewhohavehadaparticulardisease.Objective:toestimatethetrueaveragetimeuntilrecurrence.d.Population:lifetimemeasurementsforallresistorsofthistype.Objective:toestimatethetruemeanlifetime(inhours).e.Population:allgenerationXageUScitizens(specifically,assigna‘1’tothosewhowanttostar

3、ttheirownbusinessanda‘0’tothosewhodonot,sothatthepopulationisthesetof1’sand0’s).Objective:toestimatetheproportionofgenerationXageUScitizenswhowanttostarttheirownbusiness.f.Population:allhealthyadultsintheUS.Objective:toestimatethetruemeanbodytemperatureg.Population:singlefamilydwellingunitsi

4、nthecity.Objective:toestimatethetruemeanwaterconsumptionHistogramofwindDensity0.000.050.100.150.200.250.305101520253035wind1.2a.Thishistogramisabove.b.Yes,itisquitewindythere.c.11/45,orapprox.24.4%d.itisnotespeciallywindyintheoverallsample.12Chapter1:WhatisStatistics?Instructor’sSolutionsMan

5、ualHistogramofU235Density0.000.050.100.150.200.25024681012U2351.3Thehistogramisabove.HistogramofstocksDensity0.000.050.100.150.200.250.3024681012stocks1.4a.Thehistogramisabove.b.18/40=45%c.29/40=72.5%1.5a.Thecategorieswiththelargestgroupingofstudentsare2.45to2.65and2.65to2.85.(bothhave7stude

6、nts).b.7/30c.7/30+3/30+3/30+3/30=16/301.6a.Themodalcategoryis2(quartsofmilk).About36%(9people)ofthe25areinthiscategory.b..2+.12+.04=.36c.Notethat8%purchased0while4%purchased5.Thus,1–.08–.04=.88purchasedbetween1and4quarts.Chapter1:WhatisStatistics?3Instructor’sSolutionsManual1.7a.Thereisaposs

7、ibilityofbimodalityinthedistribution.b.Thereisadipinheightsat68inches.c.Ifallofthestudentsareroughlythesameage,thebimodalitycouldbearesultofthemen/womendistributions.HistogramofAlODensity0.000.050.100.150.20101214161820AlO1.8a.Thehistogramisabove.b