Answer the questions about happiness

Firstly,it is difficult to indentify one population is happier than another like whether Chinese happier than Canadians or not. The reason is that different people have different life style.Some of them like slience.Others like some place where have lots of people.So we cannot identify hapiness through the population.Then,in my opinion,my results on the on-line survey would be different if I did at another time.Because people's emotion always change in different time and different situations.Finally,I think choosing people living in cities versus rural locations is better to do with a large group of people to discover patterns of happiness in a population than choosing university students.Because we can suvey the opinion of different kinds of people not just university students.It is better to find a general idea through these different kinds of people.