Levels of Measurement

• What are the 3 levels of measurement?

  Nominal, Ordinal and Interval
• What is nominal data?


  Data that is repesented in the form of categories, 1 item can only appear in one of the categories
• What type of data is nominal data?


  Discrete
• Why does nominal data not enable sensitive analysis?

  As it does not yield a numerical result for each paticipant
• What is meant by ordinal data?


  Data which is presented in ranking form, it does not have equal intervals between each unit and may involve interpretation
• What is a weakness of ordinal data?


  It lacks precision as it is based on the subjective interpretation of a person
• What is meant by interval data?


  Data that is based on numerical scales with equal intervals, including established units of measurement and is more objective than ordinal data
• Why is interval data the most sophisticated form?


  As it is based on objective measures so therefore more precise
• What test is interval data needed for?


  Parametric test
• what measure of central tendency is used in nominal data?


  Mode
• What measure of central tendency is used in ordinal data?


  Median
• What measure of central tendency is used in interval data?


  Mean
• What measure of dispersion is used in nominal data?


  N/A
• What measure of dispersion is used in ordinal data?


  The range
• What measure of dispersion is used in interval data?


  Standard Deviation