Example 182

Example 182:  Customers at a “fast” food establishment want their food fast.  To determine the median wait time at Taco Bell in the Miami area, 16 graduate students randomly selected 16 Taco Bell stores.  Each student visited a Taco Bell store at 12:15 p.m. and ordered a crunchy beef taco, a burrito supreme, and a soda.  The wait time to receive the meal was recorded for each restaurant.  At the 5% significance level, test the claim that the median wait time is longer than 20 minutes.

Restaurant    1      2      3       4      5      6       7      8       9    10    11    12    13    14    15    16
Wait Time    23    19    15    25    30    22    18    23    24    17    21    22    26    40    20    14