A national organization has been working with utilities throughout the nation to find sites for large wind machines that generate electricity. Wind speeds must average more than 16 miles per hour (mph) for a site to be acceptable. Recently, the organization conducted wind speed tests at a particular site. Based on a sample of
wind speed recordings (taken at random intervals), the wind speed at the site averaged
with a standard deviation of
To determine whether the site meets the organization's requirements, consider the test,
where μ is the true mean wind speed at the site and
Suppose the value of the test statistic were computed to be 1.37. State the conclusion.
◦ At
α = .01, there is sufficient evidence to conclude the true mean wind speed at the site exceeds 16 mph.
◦ We are 99% confident that the site does not meet the organization's requirements.
◦ We are 99% confident that the site meets the organization's requirements.
◦ At
α = .01, there is insufficient evidence to conclude the true mean wind speed at the site exceeds 16 mph.
A pygmy hippopotamus at National Zoo.
During the Pullman strike in Chicago, workers protesting wage cuts did $340,000 in property damage,
Kootenay national park
Working-Age Fraction of the U.S. Population, 1950–2050