1-Those data collection tools are valid scientific tools because it's have been done by scientist so that means they have done those experiments to many people and figured out the information they presented.

2- I think if I do the online survey again I would have the same results because two of my friends have done twice and they had a slight different between both results. Furthermore, online survey are always right because they're using kind of technology that rarely have mistakes or errors.

3-I think the online survey would be better choice to do with a large group of people because as I mentioned before this kind of technology once in the blue moon have mistakes. So that means they will have more realistic results and more right.