Advantages of Sampling:
Advantages of Sampling: The important advantages of sampling over complete enumeration are briefly stated below:
(i) Sampling saves money as it is much cheaper to collect the desired information from a small sample than from the whole population.
(ii) Sampling saves a lot of time and energy as the needed data are collected and processed much faster than census information. And this is a very important consideration in all types of investigations or surveys.
(iii) Sampling provides information that is almost as accurate as that obtained from a complete census; rather a properly designed and carefully executed sample survey will provide more accurate results. Moreover, owing to the reduced volume of work, persons of higher caliber and properly trained can be employed to analyze the data.
(iv) Sampling makes it possible to obtain more detailed information from each unit of the sample as collecting data from a few units of the population (i.e. sample) can be more complete and thorough.
(v) Sampling is essential to obtaining the data when the measurement process physically damages or destroys the sampling unit under investigation. For example, in order to measure the average lifetime of light bulbs, the measurement process destroys the sampling units, i.e. the bulbs, as they are used until they burn out. A manufacturer will therefore use only a sample of light bulbs for this purpose and will not burn out all the bulbs produced. Similarly, the whole pot of soup cannot be tasted to determine if it has an acceptable flavor.
(vi) Sampling may be the only means available for obtaining the needed information when the population appears to be infinite or is inaccessible such as the population of mountainous or thickly forested areas. In such cases, taking $ complete census to collect data would neither be physically possible nor practically feasible.
(vii) Sampling has much smaller “non-response”, following up of which is much easier. The term non-response means the no availability of information from some sampling units included in the sample for any reason such as failure to locate or measure some of the units, refusals, not-at-home, etc.
(viii) Sampling is extensively used to obtain some of the census information.
(ix) The most important advantage of sampling is that it provides a valid measure of reliability for the sample estimates and this is one of the two basic purposes of sampling.