The amount of time spent playing violent video games correlates positively with aggressive behaviors and negatively with academic achievement. Based on your reading about interpreting correlations, what conclusions are possible from this result?

The amount of time spent playing violent video games correlates positively with aggressive behaviors and negatively with academic achievement. Based on your reading about interpreting correlations, what conclusions are possible from this result?  If this was an experimental finding, what are two sources of bias and how could they affect the results?