The four levels of measurement are, ratio, interval, ordinal, and nominal (Salkind, 2012). An example of nominal levels of measurement are political affiliations. Ordinal levels of measurement describe variables that can be placed in order (Salkind, 2012). College rank a high school GPA are both examples of ordinal levels of measurement. Interval levels of measurement, however, measures the distance between two points (Salkind, 2012). For example, the amount of time it takes to complete a test. Lastly, ratio levels of measurement describe variables that have absolute zeros (Salkind, 2012). For example, age, height, and time.
3. A standardized test is a test, usually compiled by commercial publishers, that has a standard or generic set of instructions and scoring procedures (Salkind, 2012). Standardized tests differ from researcher/teacher-made test because they can be administered to a broader range of people (Salkind, 2012).
4. Three advantages of questionnaires are they can be self-administered, they are relatively inexpensive, and participants are usually more honest due to the anonymity of