Independent variable that the researcher does not manipulate is called

A categorical variable is one

The technique which reduces heart rate, skin conductance, muscle tension, B.P., Inflammatory process, lipid level nursery utilisation, self-report of anxiety and tension is

In selection process which tests yield validity superior to other tests

What kind of question allows the respondent to answer freely in their own words

Which personality assessment tools are easy to score and can be evaluated for reliability and validity