An airline has surveyed a simple random sampleof air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight. Over the 400 travelers surveyed, 80 said e-mail access would be worth a slight extra cost.
Construct a 95% confidence intervalfor the population proportion of air travelers who are in favor of the airline’s e – mail idea.
The formula for a 95% CI for a proportion is:
p-hat – 1.96 * sqrt(p-hat * (1 – p-hat)/n) to p-hat + 1.96 * …