You are planning an evaluation of a semester-long alcohol awareness campaign at your college. After the evaluation you would ask the participants the following question: “Did the campaign alter your behavior toward alcohol consumption?” How large a sample of students should you take if you want the margin of error for a 95% confidence to be about 0.07: (a) if previous evaluations indicate that about 20% of the students surveyed will respond Yes to the question asked. (b) irrespective of the sample taken and the value of the sample proportion, ˆp. Hint: Think of part b) as a case where you need a conservative value of n (much larger than what you would need but still satisfy the conditions)
You are planning an evaluation of a semester-long alcohol awareness campaign at
your college. After the evaluation you would ask the participants the following question: “Did
the campaign alter your behavior toward alcohol consumption?” How large a sample of students
should you take if you want the margin of error for a 95% confidence to be about 0.07:
(a) if previous evaluations indicate that about 20% of the students surveyed will respond Yes
to the question asked.
(b) irrespective of the sample taken and the value of the sample proportion, ˆp.
Hint: Think of part b) as a case where you need a conservative value of n (much larger than
what you would need but still satisfy the conditions)
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