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An airline has surveyed a simple random sample of 500 air travelers to find out whether they would be interested in paying a slightly higher fare in...
An airline has surveyed a simple random sample of 500 air travelers to find out whether they would be interested in paying a slightly higher fare in order to have access to e-mail during their flight. Of those air travelers surveyed, 115 said e-mail access would be worth a slight extra cost.
1. What is the sample estimate of the proportion ()? Round to two decimal places.
2. Show whether the study meets the success/failure condition.
3. Calculate the SE(). Round to four decimal places.
4. Calculate a 99 percent confidence interval. Round to four decimal places.
5. Calculate the sample size needed in order to obtain a 2% margin of error with 90 percent confidence using the data from the previous problems. (2 points)
