Test psychometrics involves techniques and theories of psychological measurement such as individual ability, knowledge, personality attributes, attitudes, as well as educational measurements. Test psychometrics is mainly concerned with validation and construction of instruments used to measure psychological issues such as tests, questionnaires and personality evaluations. Tests psychometrics cannot be the same for different groups of individuals. Different groups of people have different attributes hence; they can only be assessed by a psychometric test designed for them.
Psychometrics is concerned with assessing individual traits and abilities. This means that the type of psychometrics used for one group of people may not apply to another group. For example, a group of disabled individuals will be tested based on their standards of ability because they cannot perform some duties that normal people can perform.
Another reason why same psychometrics cannot be used for different groups of people is because people of different age have different levels of knowledge, abilities and their levels of education differ. Therefore psychologists can only use a specific psychometric to a certain group of people.
Cultural factors affect test ability when used on different groups of people. Cultural factors such as age, religion, gender, marital status, geographical locations, economic status and individual background all influence the test ability to reflect accurate outcomes. These cultural factors influence the test outcomes hence; they can only be assessed by different psychometric tests to obtain accurate results.
Therefore, psychometric tests are designed specifically for a certain group of individuals. They cannot be used to test another group of people with different attributes. This is because cultural and physical factors affect how each group responds to the test.
Kurpius, R., & Stanford, M. E. (2006). Testing and measurement: A user-friendly guide. New york: Thousand Oaks, CA: Sage.
MCintire, S. A., & Miller, L. A. (2007). Foundations of psychological testing: A practical approach (2nd Edition ed.). London: Thousand Oaks CA: Sage.