(i) Measures which describe a population are called_______
(ii)_________ is a small proportion of a population selected for analysis.
(iii)________ scale is the most elementary scale of data measurement which labels object of measurement.
(iv)________ is the measure of the likelihood of an event.
(v) An_______ is a technique for assessing ability, personality etc. in a face - to - face situation based on information provided verbally by the subject.

Cohort and Case - Control studies

Null Hypothesis

Ordinal scale

Null Hypothesis

Alternative hypothesis

Simple random sampling and Stratified random sampling