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Back to 8.3 A Population Proportion

8.3 Exercise 8

Avg difficulty 2.5

A marketing research firm conducted a survey regarding the potential purchase of electric vehicles among adults aged 18–29. In a group of 50 adults aged 18–29, 13 of them reported they would consider the purchase of an electric vehicle. Use the “plus four” method to find a 90% confidence interval for the true proportion of adults aged 18–29 who would consider the purchase of an electric vehicle.

OpenStax Introductory Statistics 2e, 8.3 A Population Proportion, exercise 8

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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.