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Unit 3
Statistics
Resources of collecting data
Field resources Historical resources
Primary Secondary
Methods of collecting data:
Any method depends on the object for which we collect data and the size of
society , we have two methods which are : sample method – Mass
population method
The number of individuals of the layer in the sample =
?????? ?????????? ???????????? ???? ?????????????????????? ???? ?????? ??????????
?????? ?????????? ?????????????????????????????????????? ???? ?????? ?????????????? × ?????? ???????????? ???? ?????????????????????? ???? ?????? ????????????
?????? ???? ???????????? ?¯? = ? ??
The mean = ???????????? ???? ???????????? ??
The mode = the most repeated value
The median = the middle value after the arrangement
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