As a researcher you must decide which population—persons about whom you want to be able to draw conclusions—will be observed or questioned. In , every member of an entire population being studied has the same chance of being selected.

In Random sampling, every member of an entire population being studied has the same chance of being selected.

Random sampling is the usual straightforward strategy for taking a random sample. Random sampling is one of the easiest manners of accumulating data from the whole population. It incorporates choosing the aspired sample size and choosing measurements from a population in such a way that every search has an identical probability of choice until the aspired specimen size is accomplished.  

There is constantly a likelihood that the group or the sample does not describe the population as a unity, in that event, any random variation is termed as a sampling error.

well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.