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
2025-02-24
7
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/3971370.html
相关试题推荐
Acertainrectanglehasperimeter54.Iftheratioofthelengthoftherectangl
Thecost,indollars,foranappliancerepairatacertaincompanyis1.2p+20h
Whenacertainnumberisdividedby7,theremainderis0.Iftheremainderisn
When2/5ofacertainnumberisaddedtothenumberandthissumissubtractedf
Theoddsthatacertaineventwilloccuristheratiooftheprobabilitythatth
Whatisthecost,incents,ofusingacertainfaxmachinetosendnpagesofa
Ifacertaincompanypurchaseditscomputerterminalsforatotalof$540,400an
Onacertainnumberline,if-7isadistance4fromnand7isadistanceof18
Acertainintegernisamultipleofboth5andMustnbeamultipleof15?15The
AcertainhighwayhasExits1,2,3,and4inthatorder.Whichofthefollowing
随机试题
Government政府Governmentisthepoliticalsystemb
Theofficerisgallantinhisbehaviortowardhisyoungsecretary.A、braveB、pert
Whatdoesthemando?[br][originaltext]W:[1]TodayMr.Boormanisinvitedhe
Teenagerswillbetoldto"standupfortheirelders"onpublictransport—or
借款人采取自主支付的,银行将贷款资金直接发放至借款人账户后,借款人可自主支配使用
两组数据作均数差别t检验,要求数据分布近似正态而且A.要求两组数据均相近,方差相
下列属于可以质押的包括( )。 A、汇票 B、债券 C、仓单 D
内服泻下清肝、外用杀虫止痒的药物是A.番泻叶 B.郁李仁 C.芒硝 D.芦
商业银行评价企业经营管理状况时,对企业供应阶段分析的内容不包括()。A.货品质
以夏科(Charcot)三联症为典型表现的疾病是A.急性憩室炎 B.急性出血性
最新回复
(
0
)