首页
登录
职称英语
A research scientist wants to study a certain attribute of dogs. It is estimated
A research scientist wants to study a certain attribute of dogs. It is estimated
游客
2024-01-12
46
管理
问题
A research scientist wants to study a certain attribute of dogs. It is estimated that approximately 5 percent of all dogs have this attribute. If the scientist wants to study a sample of N dogs having the attribute, approximately how many dogs should be screened in order to obtain the desired sample size?
选项
A、N/5.
B、5N.
C、20N.
D、105N.
E、120N.
答案
C
解析
一科学家想研究狗的某种特性。据估计约有5%的狗具有这种特性。若这位科学家想把N只具有这种特性的狗作为一个样本来研究,那么为了得到期望的样本大小,大约需要筛选多少条狗?
解:本题的正确答案为(C)。设需筛选x条狗,则由题意可得:x×5%=N → x=20N
转载请注明原文地址:https://tihaiku.com/zcyy/3356808.html
相关试题推荐
Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinourso
Scientistssaidtheyhavefoundevidenceofagiantplanetfaroutinourso
Traditionally,universitieshavecarriedouttwomainactivities;researcha
Traditionally,universitieshavecarriedouttwomainactivities;researcha
Traditionally,universitieshavecarriedouttwomainactivities;researcha
Traditionally,universitieshavecarriedouttwomainactivities;researcha
Itseemslikeeverydaythere’ssomenewresearchaboutwhetherourfavorite
Itseemslikeeverydaythere’ssomenewresearchaboutwhetherourfavorite
Scientistsmeasuredtheimpactthatpeoplehaveontheenvironmentusingat
Scientistsmeasuredtheimpactthatpeoplehaveontheenvironmentusingat
随机试题
•Lookatthestatementsbelowandtheadvertisementsontheoppositepage.•Wh
AcupunctureRecently,acupuncturehasbecomea【1】____
Losingweightiseasierwhenthereismoneyontheline,U.S.researcherss
InsuranceinrespectofthepropertywillbecarriedoutbytheSocietyina
A.子宫颈癌 B.子宫内膜癌 C.外阴癌 D.绒毛膜癌 E.卵巢癌原发输
下列各项中,与湿热无关的是()A.急性盆腔炎 B.痛经 C.黄体萎缩不
运输改善和运输发展的利益应在全社会成员间公平分配,体现了()。A.运输的经济与
下列关于个人教育贷款的说法,错误的是()。 A.国家助学贷款实行“财政贴息、
中国期货业协会应当定期向()报告期货从业人员管理的有关情况。A.期货交易所
行政诉讼中可以缺席判决的情形有:()A.被告无正当理由拒不到庭的 B.原告或
最新回复
(
0
)