When the people who answer a mail survey are different in important ways (e.g.income level)from the people who did not answer the survey,the survey is said to have ____________________ error.

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The Answer of When the people who answer a mail survey are different in important ways (e.g.income level)from the people who did not answer the survey,the survey is said to have ____________________ error.

When the People Who Answer a Mail Survey Are Different