The formula for the correlation coefficient, as we know it today, was devised by

IQ score below _____ would indicate profound retardation.

a.) 43 b.) 20 c.) 49 d.) 35

Ernst Weber provided a formulation that is used to determine the __________

a) largest detectable stimulus. b) smallest detectable stimulus. c) largest detectable difference between two stimuli. d) smallest detectable difference between two stimuli.