A national health study reported that the proportion of students with elevated blood pressure is 0.15. The principal of a local high school believes that the proportion of students in the school with elevated blood pressure is greater than 0.15. If a large random sample is used, which of the following is the most appropriate test to investigate the principal's belief?

When the sample size is appropriately large, we can treat the distribution as normal and use the \(z\)-test. In this case, we are testing the proportion of students.