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When to choose the following graphs

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    Could you tell me when to choose the following graphs below:

    Line - shows a change in a variable with respect to increasing and decreasing the other (independent) variable. You use this to see how one variable will change another (i.e., identify a trend). For example, seeing how increasing the temperature (independent variable) increases the consumption of ice-cream (dependent variable).

    Bar - compares two or more variables and their effects on what you're measuring, but does not show how the dependent variable changes when you change the independent variable. A bar chart is therefore used to compare two static variables with relation to a common outcome/measure. For example, measuring how many ice-creams are sold in June (one independent variable) compared to July (the other independent variable).

    Pie - compares proportions of a variable, where many variables exist in making a whole (i.e. 100%). For example, seeing what percentage of ice-creams are sold in Brighton compared to London in the summer.

    Hope this helps... this is not using any official source; I've based this on my own knowledge!
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