“…Using the Spearman-Brown Prophecy formula, a set of 33 nonsense items should yield reliability of .86 for C4, which is comparable to the reliabilities of the other scores obtained in the study. A reliability of .87 for R, which is also based on the seven nonsense items is consistent with previous research on this risk measure (e.g., Slakter, 1969;Slakter & Cramer, 1969;Slakter & Koehler, 1968). Note that the mean of the C4 confidence measure is quite low (i.e., only 0.70 when the maximum possible C4 is 7.00).…”