Set C1 A random set of 30 individual data values from the original list of 197 values. A random set of 30 means of groups of 5 data values from the original list of 197 values. Set C5 (i.e. The mean is calculated for a set of 5 randomly selected data values. This is repeated 30 times and those means become your list.) Random set of 30 means of groups of 20 data values from the original list of 197 Set C20 values. (i.e. The mean is calculated for a set of 20 randomly selected data values. This is repeated 30 times and those means become your list.)