what is random sampling? what are its merits and demerits
Answers
Answer:
random sampling means that every member of the sample is selected from the group of population in such a manner that the probability of being selected for all members in the study group of population is the same
Advantages of random sampling:
1. One of the great advantages of simple random sampling method is that it needs only a minimum knowledge of the study group of population in advance.
2. It is free from errors in classification.
3. This is suitable for data analysis which includes the use of inferential statistics.
4. Simple random sampling is representative of the population
5. It is totally free from bias and prejudice
6. The method is simple to use.
7. It is very easy to assess the sampling error in this method.
Disadvantages of random sampling:
1. This method carries larger errors from the same sample size than that are found in stratified sampling
2. In simple random sampling, the selection of sample becomes impossible if the units or items are widely dispersed.
3. One of the major disadvantages of simple random sampling method is that it cannot be employed where the units of the population are heterogeneous in nature.
4. This method lacks the use of available knowledge concerning the population.
5. Sometimes, it is difficult to have a completely cataloged universe.
6. It may be impossible to contact the cases which are very widely dispersed