How could graphics and/or statistics be used to misrepresent data

How could graphics and/or statistics be used to misrepresent data? Where have you seen this done?
What are the characteristics of a population for which a mean/median/mode would be appropriate? Inappropriate?
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
How large would your population have to be for a sample to be appropriate (i.e., rather than measuring the whole population)?

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