Following are the merits of random sampling :
1. There are no chances for personal prejudice.
2. It is economical and saves time, money and labour.
3. This method is based on the law of statistical Regularity and law of Inertia. Due to this reason the selected sample contains quality of the whole population.
4. It is an easy method.
5. Sample collected through this method can be tested by comparison with other samples also.
Following are the demerits of random sampling :
1. If some special units are to be included in the sample due to their importance then this method is not suitable.
2. If the population size is small or the heterogeniety is high, then the samples taken by this method cannot fully represent the population.
3. This method is suitable only when all units of the population are independent.
