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Exercise 23

Avg difficulty 2.5

A poll found that 30%, plus or minus 5% of college freshmen prefer morning classes to afternoon classes.

  1. What is the margin of error?

  2. Write the survey results as a confidence interval.

  3. Explain what the confidence interval tells us about the percentage of college freshmen who prefer morning classes?

Lee et al., Math in Society, §3.1 Overview of the Statistical Process, Exercise 23

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Adapted from Math in Society © 2018–2024 Portland Community College Math Instructors. Licensed under CC BY-SA 4.0. Source: Math in Society. Imported at revision 68ee43c.