answer below

7. A bank branch located in a commercial district of a city has developed an improved process for serving customers during the noon to 1 pm lunch period. The waiting time of all customers during this hour is recorded over a period of one week. A random sample of 20 customers is selected, and the results are as follows: 4.21 5.55 3.02 5.13 4.77 2.34 3.54 3.20 4.50 6.10 0.38 5.12 6.46 6.19 3.79 4.86 2.79 3.65 5.79 3.23 At the 0.01 level of significance, is there evidence that the mean waiting time is less than 5 minutes? Perform a critical value approach to hypothesis testing. (Note you need to set up your null and alternative hypothesis first before proceeding with the calculation)