What is the main difference between item discrimination and item difficulty in the context of psychometric testing?
1
Item discrimination measures how consistently a test-taker performs, while item difficulty measures how hard an individual item is.
2
Item discrimination measures the number of test-takers who get an item correct, while item difficulty measures the average time taken to answer an item.
3
Item discrimination assesses how well an item differentiates between high and low performers, while item difficulty assesses the proportion of test-takers who answer an item correctly.
4
Item discrimination evaluates how interesting an item is to test-takers, while item difficulty evaluates how challenging the entire test is.