Figure 2. Version 3 NGCI item discrimination values, with accompanying values for Versions 1 and 2 where appropriate. The gray region represents values that typically indicate an item is a poor discriminator of student ability (less than 0.30).
Figure 2. Version 3 NGCI item discrimination values, with accompanying values for Versions 1 and 2 where appropriate. The gray region represents values that typically indicate an item is a poor discriminator of student ability (less than 0.30).