In: Advanced Math
First I will tell you that the convenience sampling depends on
Number of participants and and their efforts. If the sample size is large then there are less chances for error.
Let me clear this by example:-
Suppose you want to find that how many students want to pursue with math in higher studies. Then you can do this project in number of ways
1) result according to your class students
2) result according to your school
3) result according to your town
And so on the larger sample size you take more accurate your
Result will be.
Now for your class you can take survey yourself.
But for whole school you alone can't. Then you have to choose your classmates and assign them classes. Such that you can take survey of your whole school.
Now next for your whole town. Your and your classmates can't do that. You have to choose students from your school or any other who are willing to do survey with you and then distribute area and then you can do survey for your whole town.
This process continue....
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