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| === What is the difference between a bar chart and a histogram? === | | === What is the difference between a bar chart and a histogram? === |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_6dfca87b.png]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_6dfca87b.png]] |
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| == Circle or Pie Chart == | | == Circle or Pie Chart == |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_461389d1.png]]These | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_461389d1.png]]These |
| are called circle graphs. A circle graph shows the relationship | | are called circle graphs. A circle graph shows the relationship |
| between a whole and its parts. Here, the whole circle is divided into | | between a whole and its parts. Here, the whole circle is divided into |
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| values in a data set and they have values x<sub>1</sub>, x<sub>2</sub>, | | values in a data set and they have values x<sub>1</sub>, x<sub>2</sub>, |
| ..., x<sub>n</sub>, then the sample mean, usually denoted by | | ..., x<sub>n</sub>, then the sample mean, usually denoted by |
− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_174cec39.gif]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_174cec39.gif]] |
| (pronounced x bar), is: | | (pronounced x bar), is: |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_58d59706.png]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_58d59706.png]] |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_m64bbad46.png]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_m64bbad46.png]] |
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| == Skewed Distributions and the Mean and Median == | | == Skewed Distributions and the Mean and Median == |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_26c6186d.png]]We | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_26c6186d.png]]We |
| often test whether our data is normally distributed as this is a | | often test whether our data is normally distributed as this is a |
| common assumption underlying many statistical tests. An example of a | | common assumption underlying many statistical tests. An example of a |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_m2609c500.png]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_m2609c500.png]] |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_m5610ded5.gif]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_m5610ded5.gif]] |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_m48922b88.gif]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_m48922b88.gif]] |
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− | [[Image:KOER-%20Mathematics%20-%20Statistics_html_1afc44b3.png]] | + | [[File:KOER-%20Mathematics%20-%20Statistics_html_1afc44b3.png]] |
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