A survey of drivers began by random sampling

Asked by viranderdeol

A survey of drivers began by randomly sampling all listed residential telephone numbers in Canada. Of 45,956 calls to these numbers, 5029 were completed. The goal of the survey was to estimate how far people drive, on average, per day.

(a) [2 mark] Explain how non response can lead to bias in this survey.

(b) [1 mark] Based on your answer in part (a), do you think the estimate obtained by this survey is too low or too high compared to the true distance people drive on average a day?

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