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The following information is from the article College Students' Attitudes Toward UFOs, (College Student
Journal, March 2009). In a random sample of 180 college students, 10 believed that aliens were responsible
for building Stonehenge. Construct a 90% confidence interval for the true proportion of all college students
who believe this.
1
How many successes and failures are there in the sample?
2
Are the new criteria for approximate normality satisfied?
3
Compute the sample proportion, p, of college students who believe that aliens are responsible for
building Stonehenge.
4
Compute the margin of error, E.
5 Interpret the margin of error, E.
6 Give the 90% confidence interval.
7 Interpret your confidence interval in context.
2012 THE CARNEGIE FOUNDATION FOR THE ADVANCEMENT OF TEACHING
A PATHWAY THROUGH STATISTICS, VERSION 2.0, STATWAYTM - STUDENT HANDOUT

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