题目
分层抽样 (stratified sampling)
第1题
B.They both need a sampling frame of each of the subgroups of the target population.
C.In both of them,researchers want to ensure that all strata are included in the sample in order to enhance the representativeness of the sample and/or to enable comparisons between strA
D.Stratified sampling does not need a sampling frame to generate a stratified sampl
E.
E.In both of them,once the sample number of each subgroup is defined,samples are drawn in simple random sampling or systematic sampling metho
D.
第2题
A. Tom and Sam
B. Tom’s and Sam
C. Tom and Sam’s
D. Tom’s and Sam’s
第7题
A.HCU\SAM\SAM\Domains\Account\Users\Names
B.HCR\SAM\SAM\Domains\Account\Users\Names
C.HLM\SAM\SAM\Domains\Account\Users\Names
D.HCR\SAM\Domains\Account\Users\Names
第9题
以下哪条命令可以改变文件file的所有者为Sam()?
A.chmod Sam file
B.chown Sam file
C.chgrp Sam file
D.umask Sam file
为了保护您的账号安全,请在“赏学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!