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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Got deodorant? A group of students wants to perform an experiment to determine
whether Brand or Brand deodorant lasts longer. One group member suggests the
following design: Recruit student volunteers male and female. Separate by
gender, because male and female bodies might respond differently to deodorant. Give all
the males Brand deodorant and all the females Brand . Have the principal judge how
well the deodorant is still working at the end of the school day on a to scale. Then
compare ratings for the two treatments.
a. Identify any flaws you see in the proposed design for this experiment.
b. Describe how you would design the experiment. Explain how your design addresses
each of the problems you identified in part (a).