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Population:
                      The population refer to any well defined group of individuals whose charactrastics are to be studies.

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Perameter:
                      " Any quantity which defines a charactrastic of a whole population is called peramenter , for example age , income , degree etc"

 Note: so we can say , the average of a whole populationis is parameter.

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Sample :
              a sample is a part of the population to be study.

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Statistics:
                   " any  quantity which defines the charactrastics of a sample is called statistics

NOte; the average of a samploe is a statics.

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Statics do research as you wanna know how many people are graduate in Makran , you can not reserch all Makran means you cannot research the population , but you do research of some means you study the sample.
 There are following advantages of sample study.
1.Reduces costs
2.Greater speed
3.Greater accuracy

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Variable:
                   " A charactrastic of the individual of a population or a simple varies from person to person."
     in common the choice of people may differ.
 as test , color , liking , disliking.etc

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Data:
              "Observation are the recorded values of charactrastics of every individual of a population or sample , there observation are called Data."

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Descriptive Statistics:
                                     " It deals with the collection, classification , summrizaiton and presentaiton of data."

 Inferential Statistics:
                                     " It deals with conclution derived from the Date."