the NGCI are within the conventionally accepted bounds. Two items were too difficult for the Version 3 pretest,
while only one of these remained too difficult for the post-test. And, four items had low discriminatory power for
the pretest, while only two of these remained low for the post-test. For example, Items 10 and 25 are the two
most difficult items on the survey, however, Item 10 is a relatively good discriminator of student ability, while
Item 25 is not. Even students who perform very well on the survey overall often incorrectly answer Item 25 (see
Section 5.3 for a discussion of why Item 25 remains on the final version of the NGCI). In general, Version 3
postinstruction item difficulty values are lower than preinstruction values, while post-test discrimination values
are higher.
the NGCI are within the conventionally accepted bounds. Two items were too difficult for the Version 3 pretest,while only one of these remained too difficult for the post-test. And, four items had low discriminatory power forthe pretest, while only two of these remained low for the post-test. For example, Items 10 and 25 are the twomost difficult items on the survey, however, Item 10 is a relatively good discriminator of student ability, whileItem 25 is not. Even students who perform very well on the survey overall often incorrectly answer Item 25 (seeSection 5.3 for a discussion of why Item 25 remains on the final version of the NGCI). In general, Version 3postinstruction item difficulty values are lower than preinstruction values, while post-test discrimination valuesare higher.
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