Paper 1 · Research Aptitude
When some members of a population have a greater chance of being selected than others, the sampling is
AProbability sampling
BNon-probability sampling ✓ Correct
CSimple random sampling
DSystematic sampling
Correct answer: (B) Non-probability sampling — When some members have a greater chance of selection than others, it is non-probability sampling, so that is the answer.
Explanation
★When some members have a greater chance of selection than others, it is non-probability sampling, so that is the answer.
★In probability sampling every member has a known, usually equal, chance of being chosen.
★When the chances are unequal and not fully known, the sampling is non-probability sampling.
★So unequal chance of selection marks non-probability sampling.
★Simple random sampling gives every member an equal chance, the opposite of this.
★Systematic sampling is a probability method too, so unequal chance means non-probability sampling.
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