The time for collecting tolls at a tollbooth on an interstate was measured for a short period, with the following results: 17.2, 23.4, 16.7, 19.0, 21.2, 20.8, 18.7, 20.4, 18.0, 22.1, 17.9, and 19.3 s. Can the traffic authority responsible for staffing the tollbooth legitimately claim that the service time is normally distributed with a mean of 20 s and a standard deviation of 1.5 s? Use the Kolmogorov–Smirnov one-sample test.