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
45
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:http://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
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybewalking,
SydneyOperaHousemustbeoneofthemostrecognizableimagesofthemodern
()不属于监理实施细则的必要内容。A.监理范围 B.工程专业的特点 C.
下列符合油气回收设施安全技术要求的是( )。A.场地内消防道路路面宽度不应小于
B
材料: 以下是某高中生物教师的授课过程。 教学内容: 《稳态与环境》第5章
下谱例中的作品是( )根据美国歌曲《旅愁》的曲调填词而成。 A.曾志忞
下列哪项符合血小板的聚集作用A.血小板聚集往往发生在血小板激活以后B.血小板聚集
运动员:大学生A.植物:种植 B.专家:青年 C.四季:春天 D.
根据《招标投标法》,可以确定中标人的主体是()。A.经招标人授权的招标代理机构
最新回复
(
0
)