Question: Errors in surveys. An overnight opinion poll calls randomly selected telephone numbers. This polling method misses all people without a phone. Part I Review Exercises

Errors in surveys. An overnight opinion poll calls randomly selected telephone numbers. This polling method misses all people without a phone.

Part I Review Exercises 185 Is this a source of nonsampling error or of sampling error? Does the poll’s announced margin of error take this source of error into account? (Hint: See pages 58–63.)

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