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1、第十一章練習(xí)題1.家兔腦損傷后大腦左半球組織水含量(%)試驗分組nS對照(未損傷)878.860.43損傷后0.5時579.650.68損傷后3時579.770.66損傷后6時880.940.75治療組979.610.66⑴方差齊性最大方差與最小方差之比:0.752/0.432=3.0422∴可認(rèn)為五組方差齊性。或:χ2=lnSc2·-lnSi2Sc2=Si2Si2=7×0.432+4×0.682+4×0.662+7×0.752+8×0.662=12.3086Sc2=12.3086/30=0.4103χ2=30×ln0.4103-(-28.9008)=2.1738χ2<
2、χ20.05,4,P>0.05,不拒絕H0,∴可認(rèn)為方差齊性。⑵離差平方和的計算組內(nèi):SS內(nèi)=Si2=12.3086組間:SS間=(xij)2-(xij)2ninixij=ni=8×78.86+5×79.65+5×79.77+8×80.94+9×79.61=2791.99(xij)2=(ni)2=ni2nini=8×78.862+5×79.652+5×79.772+8×80.942+9×79.612=222738.1115SS間=222738.1115–2791.992/35=17.87836(3)方差分析:方差分析表來源SSMSFP組間17.8783644.46959
3、10.894<0.01組內(nèi)12.30860300.41029結(jié)論:各試驗組間大腦左半球組織水含量(%)未盡相同。⑷多重兩兩比較(Dunnett-t檢驗) ==8,n1=5,n2=5,n3=8,n4=9,===0.36516==0.32027==0.31124=(79.65-78.86)/0.3652=2.163=(79.77-78.86)/0.3652=2.492=(80.94-78.86)/0.3203=6.4946=(79.61-78.86)/0.3112=2.4098=2.62=3.28∴P3<0.01,P1,P2,P4均>0.05結(jié)論:損傷后6小時組與未損傷組大
4、腦左半球組織含水量差異有統(tǒng)計學(xué)意義,尚不能認(rèn)為其他各組與對照差異有統(tǒng)計學(xué)意義。6.雌性大白鼠子宮重量(g)種系雌激素注射劑量(μg/100體重)0.20.40.8甲106116145367乙4268115225丙70111133314丁42638719226035848010981966434370595081135426589.512091.5lii2764232919087001υ333930.3535227.8627225.2190227.89072⑴方差齊性最大方差=30.35352=1.45最小方差25.21902∴可認(rèn)為方差齊性?;?=9×ln27.8907
5、2-3×(30.35352+27.86272+25.21902)=0.1024∴可認(rèn)為方差齊性。⑵離差平方和的計算SS總=113542-10982/12=13075SS處=(2602+3582+4802)/4-10982/12=6074SS區(qū)=(3672+2252+3142+1922)/3-10982/12=6457.67SS誤=13075–6074-6457.67=543.33⑶ 方差分析表來源SSMSFP總13075.0011處理6074.0023037.0033.537<0.01區(qū)組6457.6732152.5623.771<0.01誤差543.33690.56結(jié)
6、論:注射不同劑量雌激素后雌性大白鼠子宮重量有差異;四個種系雌性大白鼠子宮重量有差異。⑷多重兩兩比較(SNK-q檢驗)===4.7580=6.5,=89.5,=120兩兩比較表qaP0.2組-0.4組24.55.1492<0.050.2組-0.8組55.011.5603<0.010.4組-0.8組30.56.4102<0.01q0.01/2,6,2=5.24,q0.05/2,6,2=3.46,q0.01/2,6,3=6.33,結(jié)論:注射不同劑量雌激素各組雌性大白鼠子宮重量間的差異均有統(tǒng)計學(xué)意義。7、 家兔血糖下降的百分比(%)試驗日期家兔編號合計12341C32.7A
7、11.2B23.2D48.1115.22B26.2D31.8C28.9A18.7105.63A–4.0C14.0D27.5B25.663.14D33.2B16.5A21.2C40.2111.1合計88.173.5100.8132.6395.0處理組ABCD47.191.5115.8140.6395.011.77522.87528.9531.325940.572152.293716.545183.3411992.7411.342724.4433211.07128.967529.3567()385.967559.2275364.13241.2