The Role of Number of choices on the Parameters, Item's Goodness of Fit and Information Function of the Items in Different Levels of Ability in Multiple Choice Tests

AbstractThe present study set out to investigate the role of number of items in the multiple choice tests which is used as the measurement and information collection instrument, so that the best form which is more accurate and suitable among the others can be determined. This study compared the discrimination parameter (aj), difficulty parameter (bj), and the amount of chance between items with four and six choices. It also compares the information function of the items at different levels of ability and the items goodness of fit with four and six choices. The participants were 985 students from different fields of study at Islamic Azad University-Tabriz Branch in Iran. They have been selected by random sampling. Cattell's parallel form (A & B) intelligence test was implemented without chronological interval. Form A had 36 items with six choices and form B had 36 items with four choices