How strong would the evidence have to be to meet those targets? To be precise, how large does dʹ have to be, namely the distance between the distributions for the signal (guilty) and the noise (innocent)? The distance may be measured in standard deviations, the most common estimate of variability. (Visually it corresponds to the width of the bell curve, that is, the horizontal distance from the mean to the inflection point, where convex shifts to concave.)
