What is the discrimination index for a green light when the observed rate of responding in the presence of the green light is 50 responses per minute and the rate in the absence of the green light is 25 responses per minute?
A) 0.75
B) 0.67
C) 0.33
D) 0.25

Question

Quizplus · Accepted Answer

The discrimination index is calculated using the formula: (Rate in presence of stimulus - Rate in absence of stimulus) / Rate in presence of stimulus. Here, it is (50 - 25) / 50 = 0.5. However, the correct calculation for the discrimination index is (Rate in presence of stimulus) / (Rate in presence of stimulus + Rate in absence of stimulus), which is 50 / (50 + 25) = 0.67.

What Is the Discrimination Index for a Green Light When