According to an article in the New York Times, new Internet dating Web sites use sex to advertise their services. One such site, True.com, reportedly received an average of 3.8 million visitors per month.
Suppose that you want to disprove this claim, believing the actual average is lower, and your random sample of 15 months revealed a sample mean of 2.1 million visits and a standard deviation of 1.2 million. Conduct the test using α = 0.05. What is the approximate p-value?