Answer to Question 1
The limitations of regression are:
1 . regression assumptions are usually violated in some way
2 . sometimes, there are too many predictor variables and they are highly correlated
3 . it is hard to know what should predict what
4 . almost nothing is really linear
5 . regression requires a certain type of data and not all data are like that
6 . regression can be overused
Answer to Question 2
F
It requires a sample size greater than 30.