4.某研究者为研究煤矿粉尘作业环境对尘肺的影响,将24只Wistar 大鼠随机分到甲、乙、丙三个组,每组8只,分别在地面办公楼、煤炭仓库和矿井下染尘,12周后测量大鼠全肺湿重(g),数据见表3。
表3 三组大鼠的全肺湿重(g)
甲组 4.2 3.3 3.7 4.3 4.1 3.3 3.5 4.1 乙组 4.5 4.4 3.5 4.2 4.6 4.2 4.4 4.1 丙组
5.6
3.6
4.5
5.1
4.9
4.7
4.8
4.4
Tests of Normality Kolmogorov-Smirnova Shapiro-Wilk g Statistic df Sig. Statistic df Sig. x 1 .208 7 .200* .879 7 .220 2 .242 9 .138 .876 9 .144 3 .178 8 .200* .963 8 .834 Levene's Test of Equality of Error Variancesa Dependent Variable:x F df1 df2 Sig. .965 2 21 .397 Tests of Between-Subjects Effects Dependent Variable:x Type III Sum of Source Squares df Mean Square F Sig. Corrected Model 3.230a 2 1.615 7.906 .003 g 3.230 2 1.615 7.906 .003 Error 4.290 21 .204 Corrected Total 7.520 23 (1)该资料用方差分析的前提要求是什么?(3分)
(2)写出甲、乙、丙三组方差齐性检验的统计量并得出结论(?=0.10)。(2分) (3)分析三组大鼠的全肺湿重有无差别,写出检验统计量并给出结论(?=0.05)。(5分)
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5. 某医师为比较某中药治疗慢性支气管炎的疗效,随机抽取110例慢性支气管炎患者分为吸烟组和不吸烟组,结果吸烟组治疗86例,显效35例,不吸烟组治疗24例,显效18例。
吸烟 * 显效情况 Crosstabulation 吸烟 吸烟 Count Expected Count 显效情况 有效 35 41.4 18 11.6 53 53.0 无效 51 44.6 6 12.4 57 57.0 Total 86 86.0 24 24.0 110 110.0 不吸烟 Count Expected Count Total Count Expected Count Chi-Square Tests Value Pearson Chi-Square Continuity Correction Likelihood Ratio Fisher's Exact Test Linear-by-Linear Association N of Valid Cases bbAsymp. Sig. df aExact Sig. (2-sided) Exact Sig. (1-sided) (2-sided) 1 1 1 .003 .006 .003 8.843 7.522 9.128 .005 .003 8.763 1 110 .003 a. 0 cells (.0%) have expected count less than 5. The minimum expected count is 11.56. b. Computed only for a 2x2 table (1)这是什么类型的资料?(2分)
(2)该资料应该用何种统计方法比较吸烟组与不吸烟组的疗效差别?(2分)写出检验统计量并得出结论。(?=0.05)(6分)
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6. 下表是12名11岁男孩的体重 x (kg) 和肺活量 y (L) 的测量数据.
表4 12名11岁男孩的体重 x (kg) 和肺活量 y (L) 的测量数据 No
1
2
3 37.1 2.75
4 41.5 2.75
5 33 2.5
6 49.5 3.00
7 41.0 2.75
8 47.2 2.25
9 41.5 2.00
10 44.7 2.75
11
12
46.2 体重(x) 32
2.75 肺活量1.75
(y) Correlations 31.5 40.4 1.75 2.75
x Pearson Correlation Sig. (2-tailed) N x 1 y .608 .036 12 12 1 * .608 .036 12 b*y Pearson Correlation Sig. (2-tailed) N 12 *. Correlation is significant at the 0.05 level (2-tailed). ANOVA Model 1 Regression Residual Total a. Predictors: (Constant), x b. Dependent Variable: y Sum of Squares .760 1.298 2.057 df 1 10 11 Mean Square .760 .130 F 5.854 Sig. .036 a Standardized Coefficients Beta t aCoefficients Unstandardized Coefficients Model 1 (Constant) x Dependent Variable: y B .714 .044 Std. Error .737 .018 .608 Sig. .969 .355 .036 2.419 (1)请写出两变量间的Pearson相系数及假设检验的结果。(?=0.05)(5分)
(2)假设肺活量满足来自正态分布总体,请写出关于体重(x)与肺活量(y)直线回归方程以及用方差分析法对总体回归系数进行检验的结果。(?=0.05)(7分)
zhangmingzhi@suda.edu.cn
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