"Early History of the Inner Product in Statistics," Master's Thesis, Ohio State University.
For much of this, linear algebra, calculus, and a semester of engineering or science probability
and statistics is sufficient prerequisite. For some of this, especially the appendices,
upper division math and statistics, such as might be in an undergraduate minor in math and
statistics, is needed.
"How Old is Statistical Inference?";
calculus and a semester of engineering or science probability and statistics are
sufficient prerequisite.
"A Relationship Strictly Between Uncorrelated and Independent";
undergraduate statistics, such as might be in an undergraduate minor in statistics, precalculus, and linear
algebra are sufficient prerequisites, if one replaces "Borel measurable function" with
"almost any function anyone can think of."