the four demerits of sample
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Answers
Answer:
1. Absence of Being Representative:
Methods, such as purposive sampling may not provide a sample, that is representative.
2. Wrong Conclusion:
If the sample is not representative, the results will not be correct. These will lead to the wrong conclusions.
3. Small Universe:
Sometimes universe is so small that proper samples cannot be taken not of it. Number of units are so less.
4. Specialised Knowledge:
It is a scientific method. Therefore, to get a good and representative sample, one should have special knowledge to get good sample and to perform proper analysis so that reliable result may be achieved.
Hey mate,
The methods, using which, we can get the samples; below are given its merits and demerits on the whole.
Merits:
1. Economical:
It is economical, because we have not to collect all data. Instead of getting data from 5000 farmers, we get it from 50-100 only.
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2. Less Time Consuming:
As no of units is only a fraction of the total universe, time consumed is also a fraction of total time. Number of units is considerably small, hence the time.
3. Reliable:
If sample is taken judiciously, the results are very reliable and accurate.
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4. Organisational Convenience:
As samples are taken and the number of units is smaller, the better (Trained) enumerators can be employed by the organisation.
5. More Scientific:
According to Prof R.A. Fisher, “The sample technique has four important advantages over census technique of data collection. They are Speed, Economy, Adaptability and Scientific approach.”
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It is based on certain laws such as:
(a) Law of Statistical Regularity
(b) Law of Inertia of Large numbers
(c) Law of Persistence