Which of the following techniques are used to control extraneous variables in research?
(A) Change of instrument
(B) Randomisation
(C) Matching
(D) Removing variables
(E) Changing the research method
Choose the correct answer from the options given below :
1
(A), (B), (C) only
2
(B), (C), (D) only
3
(C), (D), (E) only
4
(A), (B), (E) only