On Jan 6, 5:58 pm, glen herrmannsfeldt <g...@ugcs.caltech.edu> wrote: > > I used to wonder about giving questions in different variables > than the formula in the book. If students understand the concept, > then letters shouldn't matter. >
Agreed, but on an exam where there is time pressure, it always seemed a bit unfair to use new notation just to test whether they understand the concept. "Let x denote a random variable with density function f_x(X)" just muddies the waters.
P.S. Are the roots of the quadratic equation ax^2 + bx + c = 0 given by 2c/[-b +/- sqrt(b^2 - 4ac)] ?