2. Discuss the importance of item difficulty and discrimination indices in the analysis of items during the test development process.  Determining item difficulty – p value  This is proportion/percentage of individuals who answer correctly  Number of people who answered correctly divided by number of people who took the measure  The higher correct responses the easier the item  The smaller the percentages of correct responses, the more difficult  No info about charact...

1. Motivate the use of intra scorer and inters corer types of reliability as opposed to other types of reliability (5) Inter-scorer (rater) Inter-scorer (rater) reliability is used to measure the degree to which different raters/observers give consistent approximate scores/measures of the same observable fact. Examiner inconsistency is a possible source of error variance. Inter-scorer (or inter-rater) reliability can be determined by having all the test-takers' test procedures scored by ...