The co-efficient of equivalence can be computed as an index of

.................. indicates the proportion of the examinees that marked the item correctly.

The value of the discrimination index can range from

A list identifying each student, family, (or) elector in the study population is called 

The width of the interval is calculated by ............. in a systematic sample.

In ............... sampling, we have no guarantee that each elemetn has some chance of being included in the study