Suvey data and analysis on the metric proficiency, scientific literaccy and attitude.
See also blog at: http://hongqinlab.blogspot.com/2013/04/metric-proficiency-is-linked-to.html
References: Freedman, Michael P. Journal of Research in Science Teaching, 1997, vol 34(4), p343-357, Relationship among laboratory instruction, attitude toward science, and achievement in science knowledge.