Argument: A transit agency released an app showing real-time bus arrivals, and riders surveyed later reported less uncertainty about waiting. The agency concludes that the app improved riders' waiting experience. Statement 1: If riders report less uncertainty after a real-time arrival app is released, the app improved their waiting experience. Statement 2: The reduction in reported uncertainty was not entirely caused by buses becoming more predictably spaced during the same period. Which option correctly evaluates the two statements under the need test and the enough-to-prove test?