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1、第六章参数估计6.1以每天每千克体重52mmol5-羟色胺处理家兔14天后,对血液中血清素含量的影响如下表[9]:/(mg·L-1)s/(mg·L-1)n对照组4.200.35125-羟色胺处理组8.490.379建立对照组和5-羟色胺处理组平均数差的0.95置信限。答:程序如下:optionsnodate;datacommon;alpha=0.05;inputn1m1s1n2m2s2;dfa=n1-1;dfb=n2-1;vara=s1**2;varb=s2**2;ifvara>varbthenF=vara/varb;elseF=varb/vara;ifvara>varbt
2、henFutailp=1-probf(F,dfa,dfb);elseFutailp=1-probf(F,dfb,dfa);df=n1+n2-2;t=tinv(1-alpha/2,df);d=abs(m1-m2);lcldmseq=d-t*sqrt(((dfa*vara+dfb*varb)/(dfa+dfb))*(1/n1+1/n2));ucldmseq=d+t*sqrt(((dfa*vara+dfb*varb)/(dfa+dfb))*(1/n1+1/n2));locatedintheTomb,DongShenJiabang,deferthenextdayfocusedont
3、heassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetomissedfatal,whennightcamek=vara/n1/(vara/n1+varb/n2);df0=1/(k**2/dfa+(1-K)**2/dfb);t0=tinv(1-alpha/2,df0);lcldmsun=d-t0*sqrt(vara/n1+varb/n2);ucldmsun=d+t0*sqrt(vara/n1+varb
4、/n2);cards;124.200.3598.490.37;procprint;idf;varFutailpalphalcldmsequcldmseqlcldmsunucldmsun;title1'ConfidenceLimitsontheDifferenceofMeans';title2'forNon-PrimalData';run;结果见下表:ConfidenceLimitsontheDifferenceofMeansforNon-PrimalDataFFUTAILPALPHALCLDMSEQUCLDMSEQLCLDMSUNUCLDMSUN1.117550.42066
5、0.053.959074.620933.953364.62664首先,方差是具齐性的。在方差具齐性的情况下,平均数差的0.95置信下限为3.95907,置信上限为4.62093。0.95置信区间为3.95907~4.62093。locatedintheTomb,DongShenJiabang,deferthenextdayfocusedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetom
6、issedfatal,whennightcame6.2不同年龄的雄岩羊角角基端距如下表[27]:年龄/a/cms/cmn4.528.922.17135.531.812.4411建立平均数差的0.95置信区间,对应于H0:μ1-μ2=0,HA:μ1-μ2≠0的假设,推断两者间的差异显著性。答:结果如下:ConfidenceLimitsontheDifferenceofMeansforNon-PrimalDataFFUTAILPALPHALCLDMSEQUCLDMSEQLCLDMSUNUCLDMSUN1.264330.345280.050.938734.841270.90910
7、4.87090因为方差具齐性,所以平均数差的0.95置信区间为:0.93873~4.84127。置信区间内不包括0,因此两者间的差异是显著的。6.3了解我国风险识别、风险评价和风险缓解的现状,对于应对突发事件有重要作用。以下是关于应对突发公共卫生事件能力调查(共调查了60个单位)的部分数据[28]:项目单位数识别了当地可能发生的突发公共卫生事件35对所识别的突发公共卫生事件进行了风险评价17根据风险评价结果确定了当地突发公共卫生事件的工作重点6分别计算上述三个项目的0.95置信区间。答:程序如下:optionsno