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Give an example of how the researcher controls the variables?

What is another advantage about time and cost and why?

What is a criticism based on chance?

What is another criticism based on personal questions?

How is stratified sampling under taken?

What must the researcher ensure?

What is an advantage based on variables?

What is another advantage based on representativeness?

What is a criticism based on time and complexity?

What is another criticism based on practicallity and sample frame?