Students Against Drunk Driving has targeted seat-belt usage as a positive step to reduce accidents and injuries. Before a major campaign at one high school, 44 percent of 150 drivers entering the school parking lot were using their seat belts. After the seat-belt awareness program, the proportion using seat belts had risen to 52 percent in a sample of 200 vehicles. At a 0.04 signifi cance level, can the students conclude that their campaign was effective?

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