"Data Found Lacking on Effects of Gun Control Efforts" explains that an analysis in 2004 of "efforts to control violence by restricting guns says there is not enough evidence to reach valid conclusions about their effectiveness. [. . .] A serious limit in such analyses is the lack of good data on who owns firearms and on individual encounters with violence, according to the study. Research scientists need appropriate access to federal and state data on gun use, manufacturing and sales, the study urged. [. . .] The report calls for the development of a National Violent Death Reporting System and a National Incident-Based Reporting System for collecting data."14 Are these scientists mainly concerned with data production, displaying and summarizing data, probability, or statistical inference?