As part of its eco-friendly campaign, a company has asked for your advice whether installing a wind turbine will generate enough electricity to be cost effective. To produce enough electricity, the average wind speed needs to be least 17 mph. Based on historical data from the past 5 years, 43 days were randomly chosen and their wind speed measurements were written down. This resulted in an average wind speed of 18 mph with a standard error of 0.5337 mph. A histogram of these wind speeds yielded a right-skewed shape.
(b) Find the 90% confidence interval for the true average wind speed.