An internal auditor wants to describe a data set collected during an operational audit related to a time and motion study of control procedures. The procedural testing resulted in the following time estimates: 7 minutes, 15 minutes, 9 minutes, 9 minutes, and 12 minutes. Compute the various descriptive statistics that are available for providing a profile of such data sets.

In another plant, similar studies produced the following estimates: 8 minutes, 10 minutes, 9 minutes, 11 minutes, and 11 minutes. Are the two plants comparable with respect to the efficiency with which control procedures are being performed? Quantify your response.