Tajuk 1820 - Multistage sampling yg popular

Multistage Sampling... teknik asas !
Jgn ni pun tak tahu..
OT

Link : https://www.youtube.com/watch?v=EUr_1pU0myc&feature=share&fbclid=IwAR0xqjz_z9OC5D7dHsdteYfj1lUIOiJ5ejouZI5KzAGKGMI9uKjXzVjWQMg