stratified sampling

• what is stratified sampling?

  stratified sampling is used to get a proportionate sample from the sample area
• what are the advantages of stratified sampling?

  more accurate data

  more diverse data - in other methods, small populations can be easily missed

  collecting the data is more manageable

  prevents sample bias by breaking larger populations into subgroups
• what are the disadvantages of stratified sampling?

  only effective for statistical projects

  more subgroups means data can be difficult to analyse

  more planning and background information on the sample area is needed