Identify the (a) appropriate non-parametric procedure for each item and (b) provide a short justification why the test is appropriate.

The cafeteria regularly asked customers to rate the speed of their service. Suppose 15 customers were surveyed and their responses (1-Poor; 2-Good; 3-Very Good; and 4-Excellent) were recorded. From the data collected, the cafeteria owners wish to infer that the general rating of the customers is not poor.