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A researcher studied the voting plans of a sample of voters during the gubernatorial elections. At the beginning of the election campaign, half the sample supported the Republican candidate and the other half supported the Democratic candidate. However, several months later, and prior to the election date, he found that some of the voters in his sample had changed their opinions. At the end of the study, 20% of his sample supported the Republican candidate and 80% supported the Democratic candidate. This is an example of a(n) |

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