It's very difficult for me (and I'm sure many others) to take the time to digest all of this data. When you work for a living and are raising a family you just don't have the time it takes to investigate all the variables. Since I work with data sets almost every day at work, I know full well that the quality of the data is of utmost importance, followed by the manipulation of the data to come with an answer that everyone can understand and use it to find the root cause of a problem.....I also know the presenter of the data set can lead you down a thought path that may or may not be correct.
How can we know for certain that the individuals collecting the data aren't adding variability?