“…Guttmann"s lambda-2 is a better method than Cronbach's alpha to measure the reliability of a questionnaire (Osburn, 2000;Sijtsma, 2009). Thus, following previous research (López et al, 2013;Menold, Kaczmirek, Lenzner, & Neusar, 2014;Tan, Hemmelgarn, Baumgardner, & Tucker, 2017; Van der Ark, Van der Palm, & Sijtsma, 2011), this study computes Guttmann"s lambda-2 to determine the reliability of its questionnaire. Guttmann"s lambda-2 is 0.60, which is acceptable (Callender & Osburn, 1979).…”