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One of the following is an example of a question that might be asked to ascertain a problem with a nonrepresentative sample. Which one? O

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One of the following is an example of a question that might be asked to ascertain a problem with a nonrepresentative sample. Which one? O Do the signs of the residuals alternate? O Does the population have an omitted variable? O Do the residuals show nonconstant variance? O Does the sample contain about the same geographic coverage as the population

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