What Is a Confidence Interval?

Calculation: Statistics University (Two-Sample Mean)

A university wants to know more about the knowledge of students regarding international events. The are concerned that their students are uninformed in regards to basic statistical methods. A standardized test is used to assess the 16 million U.S. college students knowledge of basic statistics (national reported mean=65, standard deviation=5). A sample of 40 students are tested (sample mean=58, standard deviation=3.2). Compute a 99 percent confidence interval based on this sample's data.