A history test was administered to a simple random sample of 400 middle-school students in a large school district. One question asked students to identify the year of the American Revolution, and another asked for the year of the Civil War. The results showed that 72.5% of students correctly identified the year of the American Revolution, compared to 68.2% who correctly identified the year of the Civil War. Group of answer choices Each ticket in the box model corresponds to a student and has two values, one for the ability to answer the American Revolution question and another for the Civil War question. The values can be 0 or 1. Students are different in recognizing the year of the American Revolution versus the year of the Civil War, and this difference is statistically significant. This is an example of a randomized treatment-control experiment. The z-test is not valid because there is dependence between observations in the American Revolution and Civil War groups