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Defining and assessing test reliability and validity

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Defining and assessing test reliability and validity

  1. 1. RELIABILITY refers to the consistency of a test in measuring whatever it measures. It is the degree to which a test will yield similar or comparable results for the same students when administered at different times. This is usually measured through the computation of a reliability coefficient.
  2. 2. TEST – RETEST METHOD Test reliability is determined from the repetition of the same test. Thus, a test is administered twice. Scores obtained by the students in both test administration are rank ordered and a rank correlation coefficient is obtained with the use of Spearman Rho.
  3. 3. STUDENT SCORES – FA SCORES - SA 1 33 29 2 28 26 3 44 42 4 36 30 5 26 28 6 35 35 7 42 39 8 40 41 9 20 20 10 28 28
  4. 4. Ss-FA X Ss-SA Y RANK X RANK Y D D 33 29 6 7 1 1 28 26 7.5 10 -2.5 6.25 44 42 1 1 0 0 36 30 4 6 -2 4 26 28 9 8.5 0.5 0.25 35 35 5 5 0 0 42 39 2 4 -2 4 20 40 10 3 7 49 28 28 7.5 8.5 -1 1 SD2 = 62.5

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