Random assignment minimizes the effects of confounding variables by equally distributing them across the experimental groups. Omitted variable bias tends to occur in observational studies. I’ll explain how confounding variables can bias the results using two approaches. Understand that random sampling tends to produce representative samples and support valid inferences. CCSS.Math.Content.7.SP.A.1 Understand that statistics can be used to gain information about a population by examining a sample of the population; generalizations about a population from...

Random and Biased Samples worksheet. 65 students impacted. Description. Divide the population into groups, such as by grade level, and randomly select people from each group. Biased Sample. Enter group name.

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