500
A researcher examines 2-point thresholds for 20 participants. Each is tested on three different ares of the body (thumb, forehead, thigh) and different times of the day (9AM, 3PM, 9PM and 3AM). The 2-point threshold is the perceived distance b/w 2 points touching the skin. This is a _______ factorial and ____ is the DV.
What is 3 x 4 and perceived distance?