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Back to 8.3 A Population Proportion

8.3 Exercise 45

Avg difficulty 2.5

Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car.

  1. When designing a study to determine this population proportion, what is the minimum number you would need to survey to be 95% confident that the population proportion is estimated to within 0.03?
  2. If it were later determined that it was important to be more than 95% confident and a new survey was commissioned, how would that affect the minimum number you would need to survey? Why?

OpenStax Introductory Statistics 2e, 8.3 A Population Proportion, exercise 45

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Adapted from Introductory Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Statistics 2e. Imported at revision 50ec917.