what does stratified random sampling find in simple terms? Also, is there a difference between stratified random sampling and just random sampling?
+118613 what does stratified random sampling find in simple terms? Also, is there a difference between stratified random sampling and just random sampling?
My goodness this is testing the memory cells.
**Yes they are different.
Say in a school. children are stratified into different years. In high school where i live (NSW, Australia) the stratas would be yr 7,8,9,10,11 and 12.
If a (year) stratified random sample of 60 children is taken then
10 children would be randomly chosen from year 7
10 from year 8
...
up to 10 from year 12.
To do this, maybe all the year 7 names are placed in a hat and 10 are randomly chosen. etc.
If the 60 children were taken as a random sample then the names of all the children in the whole school would be placed in the hat and 60 would be randomly chosen.
does that make sense?
