what are the three sample types?

what is as opportunity sample?

what is a volunteer sample?

what is a random sample?

what is a strength of an opportunity sample?

why is it easier?

what is a limitation of using an opportunity sample?

why is it bias?

what is a strength of a volunteer sample?

give an example of this?

what is a limitation of the volunteer sample?

what is this known as?

what does this mean?

what is a strength of a random sample?

why is it unbiased?

what is a limitation of random sampling?

why?

what is a target population?

what is sampling?

what happens if the sample isn't representative?

what are stratified quota samples?