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3 8 A polling organization is checking its database to see if the data sources it used sampled the same ZIP codes. The variable Datasource

38A polling organization is checking its database to see if the data sources it used sampled the same ZIP codes. The variable Datasource =1 if the data source is MetroMedia, 2 if the data source is DataQwest, and 3 if its RollingPoll. The organization finds that the correlation between five-digit ZIP code and Datasource is -0.0229. It concludes that the correlation is low enough to state that there is no dependency between ZIP Code and Source of Data. Comment.

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