How random sampling will be used
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How random sampling will be used
英文回答.100字左右,
英文回答.100字左右,
In random sampling,all items have an equal chance of being selected as part of the sample.Five common random sampling techniques are:simple random sampling,systematic sampling,stratified sampling,cluster sampling,and multi-stage sampling.With simple random sampling,each item in a population has an equal chance of inclusion in the sample.Systematic sampling,sometimes called interval sampling,means that there is a gap,or interval,between each selection.This method is often used in industry,where an item is selected for testing from a production line (say,every fifteen minutes) to ensure that machines and equipment are working to specification.In stratified sampling,the population is divided into groups called strata.A sample is then drawn from within these strata.Cluster sampling divides the population into groups,or clusters.A number of clusters are selected randomly to represent the population,and then all units within selected clusters are included in the sample.No units from non-selected clusters are included in the sample.They are represented by those from selected clusters.This differs from stratified sampling,where some units are selected from each group.
Multi-stage sampling is like cluster sampling,but involves selecting a sample within each chosen cluster,rather than including all units in the cluster.
Multi-stage sampling is like cluster sampling,but involves selecting a sample within each chosen cluster,rather than including all units in the cluster.
can be used ,will be used 区别
1) simple random sample 2) stratified sampling 3)systematic
how things used to be
Professor Lee's book will show you how it can be used in oth
how long will be
英语翻译1、Random sampling (in large numbers)provides the best ch
英语翻译simple random sampling:A sample of n subjects is selecte
翻译“We used a stratified,multistage,cluster-sampling design.”
HOW LONG WILL IT BE?
he is not what he used to be 为什么不能how he used to be
do you still remeber how we used to be
that's not how it used to be怎么翻译