40. Sample survey A California polling organization is checking its database to see if the three data sources they used sampled the same zip codes (five-digit U.S. postal codes). The variable Datasource = 1 if the data source is MetroMedia, 2 if the data source is DataQwest, and 3 if it’s RollingPoll. The organization finds that the correlation between 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 the source of data. Comment.