Validity and reliability study of technological pedagogical content knowledge self-efficacy scale based on international educational technology standards (TPACK-ISTE)

The aim of this study is to develop technological pedagogical content knowledge (TPACK) self-efficacy scale based on international educational technology standards which are defined by International Standards for Technology in Education for teachers (ISTE-2008). Study groups of the research consist of senior prospective teachers studying at a faculty of education of a state university in Turkey in the fall semester of 2014-2015 academic year. The research was conducted four different groups such as Exploratory Factor Analysis (EFA, n=424), Confirmatory Factor Analysis (CFA, n=341), concurrent validity (n=93) and test-retest (n=85). To prove the relation of ISTE Standards the datum of same CFA group (n=341) is used. To define the EFA, principal components and varimax rotation methods used and a scale consisting of 27 items, six factors, explaining 62.65% of total variance, having factor loadings between .53-.89, corrected total item correlation above .30 has emerged. The CFAs (first and second order, n=341) were statistically significant and showed acceptable and good fit. To confirm the scale was based on ISTE standards, another CFA was applied within the same CFA group and four factored ISTE standards showed acceptable fit model. The concurrent validity of the scale showed positive, high level significant correlation (r=.78; p<.01). Internal consistency for Cronbach Alpha value for overall is .92 and the overall McDonald's Omega coefficient score is .96. The correlation coefficient scores of test-retest was .85 for overall scale. As a result, the developed scale (TPACK-ISTE) can be said to be a valid and reliable instrument.