Stacked data is a term which is used for a particular form of bar charts. For data classified into classes, a bar chart would comprise a set of bars, one for each class, where the height of the bar represents the variable of interest. If the data are classified according according to two criteria, one way to display the data is to use a stacked bar chart where each bar represents the classes, and, stacked on top of one another, are bars representing the secondary classes.
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ways of presenting data in statistics
All statistics are data because all statistics are formed of numbers and numbers are a type of data (numrical). But not all data is statistics because not all data is numbers, it can also be words, pictures etc. It's like saying all apples are fruit but all fruit are not apples.
how is data collected and used for the purpose of national statistics
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Statistic is singular; statistics is plural. Statistic is a single data point. Statistics is the study of collections of related data points.