Before planning a questionnaire or survey, test developers identify the scale of measurement of their data to make sure that they are in alignment with the objectives of the study. They decide what type of data they will collect and how it will be analyzed. In addition, once the test items have been written and piloted to an initial tryout group of respondents, test creators perform item analysis to determine which items should be retained in their revised test.
In a minimum of 200 words, respond to the following:
- Identify the four levels of measurement scales and their benefits in the measurement of both categorical and continuous variables for both parametric and nonparametric data. Construct an example of each type of measurement.
- Explain the process of item analysis. Why does item analysis play an important role in the process of test construction?
- How is item analysis different for knowledge-based tests versus person-based tests? Give an example.