# Methods for describing data. Methods of describing data Tables (row-coloumn table, contingency table, frequency distribution table) Graphs (line, bar,

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Methods for describing data

Methods of describing data Tables (row-coloumn table, contingency table, frequency distribution table) Graphs (line, bar, pie, pictogram, histogram, frequency polygon)

Row-Coloumn Table

Contingency Table

Frequency Distribution for Single Data

Frequency Distribution for Grouping Data

Class Intervals A symbol defining a class is called class interval (interval kelas) 41 – 50, 51 – 60, etc are called class interval

Class Limits The end numbers in a class interval is called class limit (batas kelas) 41: lower class limit of first class interval 50: upper class limit of first class interval

Class Midpoint The score which lies in the middle of a class is called class midpoint (titik tengah kelas) 45.5 is the first class midpoint

Class Boundaries The midpoint between the ordered class is called class boundary (tepi kelas) 50.5 is the upper class boundary for first class and also the lower class boundary for second class

The size or width of a class The size of a class is the difference between the upper and the lower of class boundaries The size of a class for the above table is 10

Line Graphs

Bar Graph

Pie Graph

Pictogram

Histograms and frequency poligons histogram frequency polygon

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