What methods would you use to estimate reliability and why?
a) Cronbach's alpha, because it assesses internal consistency by measuring the correlation among test items.
b) Split-half reliability, because it divides the test into halves and compares the scores for consistency.
c) Inter-rater reliability, because it evaluates consistency between different raters grading the same responses.
d) Parallel forms reliability, because it involves administering two equivalent versions of the test to the same group.