What are panelists asked to determine when calculating the content validity ratio?
A. If the test item has face vailidity and an acceptable level of reliability B. If the item is too long or too short C. If the test item is ambiguous D. If the skill or knowledge measured by the item is essential
There are several kinds of validity: face validity - does an item seem to test what it is testing. Construct validity - does the construct match the specific measurement. Quite simply, content validity when applied to a test is whether an item measures the content domain, such as a behaviour, for which it is intended.
If we are examining driver alertness, the item is not looking at other skills, but specifically at the degree of alertness. If a test item asks the examinees to describe psycho-analysis, it is not testing knowledge of cognitive psychology: its content validity is low or nil.