Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Research Aptitude Ethics in Research

Identify the threats to the internal validity of an investigation :

(A) History

(B) Instrumentation

(C) Maturation

Choose the correct answer from the options given below:

1

(A) and (B) Only

2

(B) and (C) Only

3

(A) and (C) Only

4

(A), (B) and (C)

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