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Graphical Presentation of Data

Histogram - is a graphical representation showing a visual impression of the

distribution of data. It is an estimate of the probability distribution of a

continuous variable and was rst introduced by Karl Pearson.

re!uency polygon is a graphical device for understanding the shapes ofdistributions.

"give #a cumulative line graph$- is best used when you want to display thetotal at any given time.

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%ine chart or line graph is a type of graph& which displays information as aseries of data points connected by straight line segments.

' bar chart or bar graph is a chart with rectangular bars with lengthsproportional to the values that they represent.

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' pie chart #or a circle graph$ is a circular chart divided into sectors&

illustrating proportion.

Pictograph is a way of representing statistical data using symbolic gures tomatch the fre!uencies of di(erent )inds of data.

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