Question: Respondents for the survey in Problem 18 were selected from those who agreed to participate in Harris Interactive Surveys. The surveys methodology includes the following

Respondents for the survey in Problem 18 were selected from those who agreed to participate in Harris Interactive Surveys. The survey’s methodology includes the following statement: “Because the sample is based on those who agreed to participate in the Harris Interactive panel, no estimates of theoretical sampling error can be calculated.” Explain why this could cause someone to question the results of the hypothesis test that was conducted.

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