Population vs Sample in Statistics



Population

Population indicates the all data or whole observations under a particular study area or a study variable. That means , a set of similar items or events or data is defined by population.
For example-
If we choose a particular area or subject for our study or research purpose , then we have to collect all the information related to that subject or area. Here all the collected information is our population.
That means ,
Suppose , we want to study about educational qualification of Bangladeshi people. so here all the Bangladeshi people is our population under our study variable educational qualification.

Population vs Sample-statistical aid

Sample

A representative part of population is defined by sample. That means , a sample is a subset of population which contains all the feature or attributes of population.

For above example we can say ,
                                                    population = all  Bangladeshi people
                                                    sample=peoples of Khulna division

Because , Khulna division included in Bangladesh & people of Khulna division is also exist in Bangladesh.

Sometimes ,
                     population=sample

*parameter=population characteristics
*statistic=sample characteristics

Statistic: characteristics or function of sample is defined by statistic and where the function is independent. sometimes , it is defined by the value of that function .
For example,
let we have 5 sample(20,21,23,25,23) which indicates the age (in year) of 5 students of  a college.
then we want to calculate the arithmetic mean for this sample,

so, A.M=(20+21+23+25+23)/5
             = 22.5
here A.M or sample mean is called statistic.







How to analyze data using SPSS (for beginners)-part 1
How to analyze data using SPSS (part-2), how to input data in SPSS
How to analyze data using SPSS (part-3), how to import data in SPSS from excel file
How to analyze data using SPSS (part-4), how to sort data in SPSS
How to analyze data using SPSS ( part-5) how to merge file in SPSS?
How to analyze data using SPSS ( part-6), how to merge file in SPSS
How to analyze data using SPSS (part-7), Finding missing values, Replacing missing values, Coding missing values in SPSS
How to analyze data using SPSS (part-8), variable transformation, Recoding variables in spss

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