Table 3.

Effect of test reliability on the confidence intervals for test scores

Reliability Coefficient (Cronbach α)SE, %95% Confidence Interval, %
0.54.2±8.3
0.63.8±7.4
0.73.3±6.4
0.82.7±5.3
0.91.9±3.7
  • Note: data are derived from a test with a mean score of 80% and SD of 6%.