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Back to 8.3 A Confidence Interval for A Population Proportion

8.3 Exercise 1

Avg difficulty 2.5

Suppose that a market research firm is hired to estimate the percent of adults living in a large city who have smartphones. Five hundred randomly selected adult residents in this city are surveyed to determine whether they have smartphones. Of the 500 people sampled, 421 responded yes - they own smartphones. Using a 95% confidence level, compute a confidence interval estimate for the true proportion of adult residents of this city who have smartphones.

OpenStax Introductory Business Statistics 2e, 8.3 A Confidence Interval for A Population Proportion, exercise 1

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