A Population Proportion · Try It 5
The survey referenced in talked to adults aged 18–29 in smaller focus groups but also interviewed additional individuals over the phone. When the study was complete, 588 adults aged 18–29 had answered the question about their potential purchase of an electric vehicle with 159 saying that they would consider such a purchase. 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 based on this larger sample. Compare the results to those in.
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OpenStax, Introductory Statistics 2e · §8.3 A Population Proportion · Try It 5
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