Sampling technique :
– Sample is a smaller collection of units from a population used to determine truths about the population.
– Smaller representative of the total entity.
Optimum sample is the one that has :
a) Efficiency
b) Representativeness
c) Reliability
d) Flexibility
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Sample Survey |
Census Survey |
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a) Only few units of population is studied. |
a) Study of whole population. |
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b) Information collected at any time according to interest of researcher. |
b) Periodic collection of information. |
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c) require relatively less amount of money and time. |
c) Require large amount if money , time and labor. |
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d) Less reliable result. |
d) More reliable result. |
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e) Chances of error is more. |
e) Chances of error is less. |
Sampling frame :
– Source material from which sample is drawn.
Universe :
– Total population from which sample is taken.
– It is two types :-finite and infinite.
Characteristics of good sample:
a) True representative.
b) have small sampling error.
c) Must be viable in context of fund.
d) Sample result must co-incide with universe result.