Frequency Distribution Table

Frequency distribution table

shows the number of items falling into each group

Class limits

the end number of the class

Class mark

midpoint of the class

Class size

the difference between the upper class boundaries of the class and the preceding class

Class frequency

numbers of observations falling in the class

Class intervals

numbers defining the class

Class boundaries

the true class limits (Upper class boundary (UCB) and Lower class boundary (LCB))

Relative frequency distribution

class frequency over number of observations

Cumulative frequency distribution

– shows the accumulated frequencies of successive classes, beginning at either end of the distribution

>CF

shows the number of observations greater than LCB

<CF

shows the number of observations less than UCB

Frequency histogram

a bar graph that displays the classes on the horizontal axis and the frequencies of the classes on the vertical axis

Frequency polygon

a line chart that is constructed by plotting the frequencies at the class mark and connecting the plotted points

Ogive

graphs of the cumulative frequency distribution

<ogive - the <CF is plotted against the UCB
>ogive - the >CF is plotted against the LCB