(a) Write down the name of the sampling method for each of the following cases: (i) Every 30th product in the production line is selected for quality control. (ii) Fair representatives of staffs are...

(a) Write down the name of the sampling method for each of the following cases:
(i) Every 30th product in the production line is selected for quality control.

(ii) Fair representatives of staffs are selected randomly from different departments to conduct a survey
about the gender distribution.

(iii) Students are selected based on random numbers to take place in a survey about their favorite
subjects