© The Author(s) 2015. Published by Science and Education Publishing. Table Test Statisticsa D S P A Mann-Whitney U 5467.000 5142.000 4775.500 6135.500 Wilcoxon W 20345.000 20020.000 19653.500 21013.500 Z -15.463 -15.643 -15.867 -15.394 Asymp. Sig. (2-tailed) .000 a. Grouping Variable: JE >= 4 (FILTER) Sabah Hejres et al. Investigating the Effectiveness of Leadership Styles on Instructional Leadership and Teachers Job Expectancy in Kingdom of Bahrain. American Journal of Educational Research, 2017, Vol. 5, No. 7, 694-709. doi:10.12691/education-5-7-2 © The Author(s) 2015. Published by Science and Education Publishing.