at the obliques lengths varied concomitantly with the sizes of the angles in order to keep the distances between opposite obliques constant (Rajamanickam, 2002). 26 participants were used for experiment. The results indicated that the end distances of the obliques varied as the angle sizes but in a factorial design manner. Therefore, these results strongly indicate that there are immense effect of distance and angle in the interaction between the two variables (Goldstein, 2010).
The study involved the use of original collection of variation of Muller – Lyer illusion. This original variation helps the study in investigating the effects of changing the fin’s angles apparently to the length of the lines. The experiment uses lines to represent the participants (Rajamanickam, 2002). The use of lines is adopted to depict the standard Muller – Lyer presentation. The participants in the experiment are to adjust the finless lines to make the same lengths. Computer mouse is used to make the adjustments using a slider. The movement of the slider up and down adjusts the red line thereby changing the length of the line. The experiment arranged as in figure one below.
The fin angles are the design variables that is made to vary from 15 to 165 degrees at an interval of 15 degrees. At the stated interval, there are 11 levels and between angle 15 and 75 degrees, “fins in” stimuli is created while angles between 105 and 165 degrees create the “fins out” stimuli. These stimuli create two sets of the 11 trial that are used to conduct the experiment. Notably, angle used for each set is chosen at random from the 11 sets and the chosen angle never reappears within the same set of trial, but can do so in another trial; therefore, the angle be used twice has 22 chances in the entire experiment.
The length of dependent variables are determined by the length between two lines since such variable have different lengths. Therefore, in this case, the red line that is attached