; (14) by inserting after paragraph (17), as redesignated by paragraph (5), the following: (18) Geographic region The term geographic region means each of the 10 geographic regions served by the regional educational laboratories. ; (15) by inserting after paragraph (19), as redesignated by paragraph (5), the following: (20) Indian tribe The term Indian Tribe has the meaning given the term in section 4 of the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 5304 ). ; (16) by inserting after paragraph (22), as redesignated by paragraph (5), the following: (23) Minority-serving institution The term minority-serving institution means an institution of higher education described in section 371(a) of the Higher Education Act of 1965. ; (17) in paragraph (24), as redesignated by paragraph (5), by striking section 133(c) and inserting section 133(g) ; (18) by striking paragraph (25), as redesignated by paragraph (5), and inserting the following: (25) Principles of scientifically valid research The term principles of scientifically valid research means research standards that— (A) apply rigorous, systematic, and objective methodology to obtain reliable and valid knowledge relevant to the needs of students, families, practitioners, education system leaders, and policymakers; (B) present findings and make claims that are appropriate to, and supported by, the methods that have been employed; and (C) include, appropriate to the research being conducted— (i) use of research designs and methods appropriate to the research question posed; (ii) use of systematic, empirical methods that draw on observation or experiment; (iii) use of data analyses that are adequate to support the general findings; (iv) making claims of causal relationships only in random assignment experiments or other designs (to the extent such designs substantially eliminate plausible competing explanations for the obtained results)