Questions to think about

  1. Positive correlation but negative coefficient in regression?

    Related: http://stats.stackexchange.com/questions/65446/postive-correlation-but-negative-coefficient-in-regression

  2. How To Determine If A Sample Is Representative

    Example: search engine queries: Evaluating the retrieval effectiveness of Web search engines using a representative query sample

  3. Statistical test to tell whether two samples are pulled from the same population?

    Summary:  Summary of Statistical Tests

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