Select the Desired Level of Significance The most commonly used level of significance is .05, though many believe there is no logical evidence in support of this value being the standard for significance testing (Wong, 2016). Because it is so widely accepted, however, .05 is utilized for the purpose of this example. Compute the Calculated Difference Value The equation utilized for this example is: t =- p1 - p2 p1(1 - pl) p2(1 - p2) n1 n2 Utilizing the following data: p1 = 10 / 20 = 0.5 p2 = 6 / 20 = 0.3 n1 = n2 = 20 = 1.319 t =_ .5 - .3 .25 .21 V 20 20 d.f. = (20-1) + (20-1) = 38