与病例对照研究样本大小估计无关的因素是
A．研究因素的人群暴露率
B．研究因素的相对危险度
C．研究疾病的发病率
D．检验的显著性水平
E．检验的把握度
参考答案：C
解析：病例对照研究样本大小取决于下列四个参数：①研究因素在对照组中的暴露率；②预期的该因素引起的相对危险度 RR或暴露的比值比OR；③希望达到的检验显著性水平，即假设检验第1类错误的概率α；④希望达到的检验把握度(1-β)，β为统计学假设检验第Ⅱ类错误的概率。
| 阅读理解。 | |||||
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| 1. On Saturday morning, you can _____. | |||||
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| A. go to watch a ball game B. take children to play games at the City Theatre C. go to the Central Park for a picnic | |||||
| 2. The Red Birds ballgame _____. | |||||
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| A. is in the afternoon B. is outside C. is at the gate | |||||
| 3. You can eat many different food from all over the world if you _____. | |||||
[ ] | |||||
| A. go to the City Theatre B. go to the Central Park C. buy tickets at the gate | |||||
| 4. "The Zoo" is _____. | |||||
[ ] | |||||
| A. a US concert B. a park with many red birds in it C. a music group | |||||
| 5. Mr. Turner wants to have a nice Saturday. Which is not possible for him to do? | |||||
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| A. Watching a ballgame and having a picnic. B. Having a picnic and seeing a film. C. Listening to a concert and watching a ballgame. |