Did you retrieve the stats from a primary source (directly from the data collector) or from a secondary source that is just citing the information. Remember to cite the primary source for the data.
Who authored the survey or study that produced the data and statistics? What are their credentials?
Why was the information collected? Who are the intended users? Is there bias or a specific agenda at play?
Determine the time frame for the statistics under review. There is often a time lag between data collection and data reporting because analysis takes time.
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