difference between diagram and graph for class
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Difference between diagram and
graph
A diagram is a visual form of
presentation of statistical data
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A graph is a visual form of presentation of
statistical data which is drawn in a graph
paper
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diagram graph
Paper Ordinary Graph paper
undersatndability Easily Some efforts
Variables More Less
Analysis not used for further used
Comparision comparision Reltionship (time)
Data represented Bars , pie Points and lines t
attractiveness More attrctive Less
Mostly used Advertising Researchers
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diagram
One dimensional diagrams
Line
Bars
vertical bar
Horizonatal bar
Multiple or compound
Sub divided bar diagrams
Two dimensionalPie
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Graph
Histogram
Frequency polygon
Cumulative frequency curve
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Line diagram
It is simple to draw
X- axis discrete data variabes
Y axisfrequency
On the basis of the size of fiqures , the heightsof lines are drawn
The distance in the bars are kept uniform
The limitation of the diagram is not attractive
No width
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Draw the line diagram
Year No of students passed
2001 5
2002 7
2003 12
2004 5
2005 13
2006 15
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A bar chartor bar graphis a chartwith
rectangularbars with lengthsproportional to
the values that they represent. The bars can
be plotted vertically or horizontally
http://en.wikipedia.org/wiki/Charthttp://en.wikipedia.org/wiki/Rectanglehttp://en.wikipedia.org/wiki/Lengthhttp://en.wikipedia.org/wiki/Lengthhttp://en.wikipedia.org/wiki/Rectanglehttp://en.wikipedia.org/wiki/Chart -
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three types
Simple bar
Multiple bar
Subdivided bars
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How Is the Information
Presented?
A bar graph is made.
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Chocolat Vanilla Strawberr Mint & C Rocky RBubble G
Students
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A bar chart is made up of columns plotted ona graph. Here is how to read a bar chart.
The columns are positioned over a label that
represents a categorical variable. The height of the column indicates the size of
the group defined by the column label.
The bar chart below shows average per capitaincome for the four "New" states - New Jersey,New York, New Hampshire, and New Mexico
http://stattrek.com/Help/Glossary.aspx?Target=Categorical%20variablehttp://stattrek.com/Help/Glossary.aspx?Target=Categorical%20variable -
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Bar chartsare often used to present data in apictorial form to illustrate the informationcollected and highlight important points. They
are especially useful to depict monthly carproduction, monthly sales, quarterly profit,average annual rainfall etc. A bar chartprovides a useful comparison of data over
time. The height of each bar shows the totalamount of the item of interest for each month(or year).
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Bar charts are drawn with parallel bars placed
vertically (or horizontally). The widthof each
bar andthe spacingbetween the bars are kept
the same to avoid giving a misleading
representation. The height of the bar is drawn
to scale to represent the amount of the item.
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The yearly production of cars by a particular
company is recorded as follows:
Draw a bar chart to display this information.
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Multiple bar diagrams
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It is simple to read a bar chart. Just look at the required barand read off the value. E.g. The bar chart shows that thenumber of cars produced was 160 000 in 2001, 200 000 in2002 and 320 000 in 2003.
Bar charts are used to describe only simple pieces of databut can describe a data set clearly and provide immediatevisual impact. It is clear from the bar chart that the carproduction by the company had increased more slowlybetween 2001 and 2002 than between 2002 and 2003.
Bar charts are useful for presenting data sets consisting of anumber of values that are each assigned to differentcategories such as years, months, quarters
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Two dimensional diagram
Pie
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To draw a pie chart, divide the circle into 100
percentage parts. Then allocate the number
of percentage parts required for each item.
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A family's weekly expenditure on its house
mortgage, food and fuel is as follows:
Draw a pie chart to display the information.
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Solution:
We can find what percentage of the total
expenditure each item equals.
Percentage of weekly expenditure on:
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How Is the Information
Presented?
A pictograph is made.
Chocolate
Vanilla
Strawberry
Mint & Chip
Rocky Road
Bubble Gum
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Graph
A visual presenattion of graph using special
paper
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Types
Histogram
Frequency polygon
Cumulative frequency curve (ogive)- less than ogive
- more than ogive
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Histogram
Class intervals marked in the x axis
Frequencies are marked in the y axis
Length and breadth is more important
Each rectangle is joined with other
Blan space between the rectangles refers no
vlaues in that class interval
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Frequency polygon
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Stem and leaf
Stems
150
140130
120
110
100
90
80
Leaves
1
2 6
4 5 7 9
1 2 2 2 5 7 9 9
0 2 3 4 4 5 7 8 9 9
1 1 4 7 8
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In a stemplot, the entries on the left are called stems;and the entries on the right are called leaves. In theexample above, the stems are tens (80 and 90) andhundreds (100 through 140). However, they could beother units - millions, thousands, ones, tenths, etc. Inthe example above, the stems and leaves are explicitlylabeled for educational purposes. In the real world,however, stemplots usually do not include explicitlabels for the stems and leaves.
Some stemplots include a key to help the user interpretthe display correctly. The key in the stemplot aboveindicates that a stem of 110 with a leaf of 7 representsan IQ score of 117
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find rangestem 80
70
6050
40
30
20
10
leaf
1
4 72 2 6
0 2 5 7 9 9
5 7 9
7 9
1
The stemplot below shows the number of hot
dogs eaten by contestants in a recent hot dog
eating contest