6.What is sample?
In research a sample is a
selected group of people or items from a larger population for research. The sample
should be representative of the population.
Why we select sample?
1.
We want to draw conclusions about populations.
2.
We did not select data from all population.
3.
Data collection is time consuming.
4.
We did not study whole population due to time constrains.
What is Sampling bias?
Sampling bias is to do favor in
the selection of sample. Sampling bias occurs when researcher did not collect
enough information through questionnaires. The researcher did not have enough
time to conduct interviews. The study population is not accessible. The
researcher did not want to give accurate results and wants to favor any one.
Types of Sampling
The convenience sampling
The
researcher selects population according to his convenience from a population
Purposeful sampling
The researcher selects
population according to the study purpose.
Types of Purposeful sampling
The random sampling
The researcher selects
population from the sample randomly.
Types of Random Sampling
Simple random sampling
Researcher collects information
about each and every member of sample. A table of random numbers is used, and a
number is assigned to every member.
Systematic Random Sampling
Researcher uses sampling frame
to select the sample from population.
Stratified Sampling
researcher divides the
population in groups and sub groups to select sample from population.
Researcher decides the formula of selection of sample.
Cluster Sampling
researcher identifies the place
and groups where the sample can be available and then selects the sample.
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