Dealing with Assumptions

Question 1

Does random sampling need to be applicable to the population you are studying?

Answer 1

Yes

Question 2

What to ask yourself if the assumptions of the experiment are not met?

Answer 2

Is it serious?
Can you deal with it by transforming the data?
Should another more appropriate test be used?

Question 3

When is violating the homogeinity of variance assumption a problem?

Answer 3

When it increases