Does English proficiency affect academic performance?

American Exam Services, TOEFL Scores – USA Universities, http://www.americanexamservices.com/about-the-toefl/toefl-scores-usa-universities (Accessed May 10 2016). Allgood, 2015, Research on teaching economics to undergraduates, J. Econ. Lit., 53, 285, 10.1257/jel.53.2.285 Al-Musawi, 1999, Test of English as a foreign language and first certificate of English tests as predictors of academic success for undergraduate students at the university of Bahrain, System, 27, 389, 10.1016/S0346-251X(99)00033-0 Andrade, 2006, International students in english-speaking universities, J. Res. Int. Educ., 5, 131, 10.1177/1475240906065589 Austrade, 2017. Education Data, https://www.austrade.gov.au/Australian/Education/Education-Data/2017/Summaries-and-news/summaries-and-news (Accessed April 2017). Ayers, 1992, TOEFL performance and success in a master's program in engineering, Educ. Psychol. Meas., 52, 973, 10.1177/0013164492052004021 Chalhoub-Deville, 2000, What to look for in ESL admission tests: Cambridge certificate exams, IELTS, and TOEFL, System, 28, 523, 10.1016/S0346-251X(00)00036-1 Cho, 2012, Relationship of TOEFL iBT® scores to academic performance: some evidence from American universities, Lang. Test., 29, 421, 10.1177/0265532211430368 Crawford, 2014, Why are first-year accounting studies inclusive?, Account. Finance, 54, 419, 10.1111/acfi.12007 Crawford, 2015, The impact of individual factors on the academic attainment of Chinese and UK students in higher education, Stud. High. Educ., 40, 902, 10.1080/03075079.2013.851182 Edwards, 2012, A survey of international practice in university admissions testing, High. Educ. Manage. Policy, 24/1 Emerson, 2004, Comparing student achievement across experimental and lecture-oriented sections of a principles of microeconomics course, South. Econ. J., 70.3, 672, 10.2307/4135338 ETS, TOEFL, Compare TOEFL Scores, https://www.ets.org/toefl/institutions/scores/compare/ (Accessed May 10 2016). Foster, 2012, The impact of international students on measured learning and standards in Australian higher education, Econ. Educ. Rev., 31, 587, 10.1016/j.econedurev.2012.03.003 Graham, 1987, English language proficiency and the prediction of academic success, TESOL Q., 21, 505, 10.2307/3586500 Grave, 2011, The effect of student time allocation on academic achievement, Education Economics, 19, 291, 10.1080/09645292.2011.585794 Hanushek, 1979, Conceptual and empirical issues in the estimation of educational production functions, J. Hum. Res., 14, 351, 10.2307/145575 Institute of International Education, 2016, International students by field of study, 2014/2015–2015/16, Open. Doors Rep. Int. Educ. Exch. Li, 2016, The value of a redesigned program and capstone course in economics, Int. Rev. Econ. Educ., 22, 48, 10.1016/j.iree.2016.05.001 Matross Helms, 2014 Messner, 1995, The test of english as a foreign language: examination of the “cut-off scores” in US universities, Int. J. Educ. Manage., 9, 39, 10.1108/09513549510082378 Morris, 2014, The importance of English language competency in the academic success of international accounting students, J. Educ. For. Bus., 89, 178, 10.1080/08832323.2013.819315 Vinke, 1993, English proficiency and academic success in international postgraduate education, High. Educ., 26, 275, 10.1007/BF01383487 Wait, 2009, Relationship between TOEFL score and academic success for international engineering students, J. Eng. Educ., 98, 389, 10.1002/j.2168-9830.2009.tb01035.x