In this experiment, a participant was presented with multiple stimuluses consisting of different sized circles. The target circles ranged in size, with a radius of 10-, 30-, or 50-pixels, and the participant would then use a slider to adjust the matching circle to the size of the target circle. The target circle’s size varied from one trial to the next, with each size having a total of 10 trials, which made up the total sample size of 30 trials for each subject. For this experiment, the independent variable is the size of the target circle, and the dependent variable is the size of the matching circle (Sage, 2016). The main goal of this experiment is to capture both the accuracy and the precision of a subject in matching circle sizes, measured through the mean and standard deviation, respectively.

The hypothesis is that the mean size of the matching circle should be close to the actual physical size of the target circle, and that the deviations from the mean should become larger as the physical size of the target circle increases. This is based on Weber’s Law, which is concerned with the amount that a physical stimulus would need to change before there is an awareness of a difference, or in distinguishing a change (Hergenhahn & Henley, 2014). Basically, there should be a noticeable and systematic increase in the standard deviation based on an increase in size of the target circle, while the matching circle mean should stay close to the actual physical size of the target…