I've looked in my many sources of notes but ......

[psychlaw]

........ cant seem to find anything on this: Random Stratified Sampling

What is it? Can someone please explain it to me and give me an example

thanks


(Hate research methods!)


ALSO
What is an extraneous variable?

[moshi]

random stratified sampling is when the population is categorised into subgroups (e.g. age, gender, ethnic group), and then participants are randomly selected from each subgroup

extraneous variables are variables other than the independent variable that may affect the dependent variable in an unwanted way (if they haven't been controlled for, then they become confounding variables)

[daniel99]

random stratified sampling is when the participants are representative of the target population, so if your school had a ratio of 1 male to every 2 females, then the experiment would have the same ration 1:2.

[psychlaw]

random stratified sampling is when the participants are representative of the target population, so if your school had a ratio of 1 male to every 2 females, then the experiment would have the same ration 1:2.

But thats just stratified sampling, isnt it?

[Nick]

random stratified sampling is when the population is categorised into subgroups (e.g. age, gender, ethnic group), and then participants are randomly selected from each subgroup

That's fine but you're missing half the definition. You need to also include that participants are selected so that the proportion of people from each subgroup mirror the same proportions that exist within the wider population.

[moshi]

ohok thanks! (i initially thought that was just stratified sampling)