Definitions [6]
A Pictograph is a chart that uses pictures or symbols to represent data. Each picture stands for a specific number of items, making the data easy to understand at a glance.
Double bar graph: A double bar graph is a graphical display of information using two bars beside each other at various heights.
Interpretation of a double bar graph: Interpretation of a double bar graph means the action of explaining the meaning of the double bar diagram.
Line graph: A line graph displays data that changes continuously over periods of time.
- Linear graph: A line graph which is a whole unbroken line is called a linear graph.
- Cartesian system: The system used to describe the position of a point in a plane is called the Cartesian system.
- Origin: The point of intersection of x and y lines is called the origin.
- Abscissa: X-coordinate tells how many units to move right or left. It is also called the Abscissa.
- Ordinate: Y-coordinate tells how many units to move up or down. It is also called the Ordinate.
- Cartesian Coordinate: X-coordinate and y-coordinate taken together are called cartesian coordinates or coordinates of a point and denoted by (x, y).
- Ordered pair: The x-coordinate comes first, and after this y-coordinate comes. (x, y) is called an ordered pair.
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Independent Variable: Anything which is completely independent and its quantity do not depend on any other factor then it is called Independent Variable.
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Dependent Variable: Anything which increases or decreases with the quantity of any other factor or it is dependent on any other factor then it is called Dependent Variable.
Formulae [1]
\[\text{Central angle}=\frac{\text{Value of component}}{\text{Total value}}\times360^\circ\]
Theorems and Laws [1]
State whether True or False. Correct those are false.
The coordinates of the origin are (0, 0).
True
Key Points
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A pie diagram represents data using a circle.
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The whole circle = total data = 360°.
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Each part of the data is shown by a sector.
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The central angle of a sector is proportional to the data value.
- Larger value → larger sector, smaller value → smaller sector.
- A Histogram is a graphical representation of a grouped frequency distribution using rectangles.
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It is used for continuous grouped data.
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Class intervals are shown on the X-axis.
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Frequencies are shown on the Y-axis.
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Rectangles are drawn without gaps between them.
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The height of each rectangle is proportional to its frequency.
