1.ch12, ch15 共笔已经发了，请找我或家宁领取 电脑课的共笔都已经在ftp上了，请取用 2.娜姐：「只会考14和15章的公式」 但是大家还是多少看一下前几章的公式吧 3.ch15的作业已经发回，包括以前所有作业，请大家领回， 考完生统我会立刻把他们回收~~ 男生请来304寝，女生请洽郭家宁 ---------------------------------------------------- ch15答案 1. 略 4. 略 6. (a) 0.01 (b) 0.025 (c) 4.61 8. (a) Table of expected counts drove while Year -------------------- total driving 1983 1987 ------------------------------------------------- YES 1116.3 1124.7 2241 NO 1520.7 1532.3 3053 ------------------------------------------------- total 2637 2657 5294 x^2=54.94 df=1 p<0.001<α=0.05 所以reject 虚无假说 (α=0.05) (b) There does appear to be an association between driving while drinking and calendar year. (c) p hat one=0.474 p hat two=0.373 p hat=0.423 z=7.43 p<0.001<α=0.05 所以reject 虚无假说 (α=0.05) (d) (0.0745, 0.1274) (z=1.96) (e) The 95% confidence interval does not contain the value 0. Since we reject the null hypothesis that the population proportions are identical, we would not have expected that it would. 12.(a) use McNemar's test x^2=8.10 df=1 0.001<p<0.010<α=0.05 所以reject 虚无假说 (α=0.05) (b) In the case, the data are presented as if they were independent rather than paired samples. There are 6650 observations and only 3325 slides. The data would be analyzed(incorrectly) using Chi-square test. 17.(a) 2*2 Contingency Table 子宫外孕 骨盆发炎 ------------------ total yes no ------------------------------------------------ yes 28 6 34 no 251 273 524 ------------------------------------------------ total 279 279 558 (b) 胜算比OR=5.08 (c) ln(OR)=1.625 se│ln(OR)│=0.210 99% confidence interval for the logaritum of the odd ratio: 1.625±2,58(0.210) 99% confidence interval for the odd ratio itself: (2.95, 8.73) 乙班生统组头 --

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