A Population Proportion · Example 4
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 · Example 4
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