An advertising company wants to collect data for a study on eating habits. For t

Question

An advertising company wants to collect data for a study on eating habits. For the first round of questioning 60 people are randomly chosen to answer a survey question. Those 60 people are then asked to refer two family members for the second round of questioning. Which is true about the sampling process? The second round may yield biased results because the family members of the randomly selected people may share common views. Both rounds of questioning will probably yield reliable because the data were recorded by means of questioning. The first round may yield biased results because the people chosen were recruited by an advertising company. Both rounds of questioning may yield biased results because data were collected by means of questioning.

Explanation / Answer

The advertising company is collecting data for a study on eating habits. 60 persons are randomly chosen for a survey and are asked to answer a question. In the second round of survey, these 60 persons are asked to refer 2 family members each. Since, in the second round, the people are not chosen randomly and since the people chosen are family members of 60 persons chosen in the first round, the second round results may be biased as the family members of the 60 persons chosen randomly earlier may have common habits and views. The first option is the correct answer.

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