The function of random numbers was used to randomize and assign people to groups; Randomization using Excel software is as follows:
First, in one column, the groups are entered as A, B, c and below; Because the number of samples in each group is set to 30 (including sample loss), therefore, 30, B, A c should be entered in order. In the opposite column, random numbers are generated using the RAND command. In the next step, using the sort command, the generated random numbers are sorted from small to large or vice versa, which changes the order of the groups, i.e. c A, B. Using the new order, people are assigned to different groups.