Which of the following are CORRECT?
A. If observations are selected purposively, it is called a method of non-random sampling
B. If observations are selected in an ad‐hoc manner, it is called a method of non‐random sampling
C. If observations are selected in a systematic manner it is called a method of non‐random sampling
D. If observations are selected on the basis of judgment, it is called a method of non‐random sampling
Choose the correct answer from the options given below:
1
A, B and C only
2
B, C and D only
3
A, C and D only
4
A, B and D only