levels of measurement

• What are the three levels of measurement mentioned?

  Nominal, ordinal, and interval
• What level of measurement is used when students stand based on height?

  Ordinal
• What level of measurement is used when students arrange themselves in height order?

  Ordinal
• How can height interval data be obtained?

  By measuring height with a ruler
• What levels of measurement are involved in the following tasks: good/bad drivers, ranking prejudice, measuring reaction time, aggression in boys/girls, ranking aggression, comparing average heights?

  1. Good/bad drivers: Nominal
  2. Ranking prejudice: Ordinal
  3. Measuring reaction time: Interval
  4. Aggression in boys/girls: Nominal
  5. Ranking aggression: Ordinal
  6. Comparing average heights: Interval
• Why is the number of words remembered treated as interval data?

  Assumes each word has equal memorability
• What is a better way to treat the number of words remembered?

  As at least ordinal data
• What are the measures of central tendency for different levels of measurement?

  • Nominal: Mode
  • Ordinal: Mode, Median
  • Interval: Mode, Median, Mean
• What are the measures of dispersion for different levels of measurement?

  • Nominal: None
  • Ordinal: Range
  • Interval: Standard deviation
• What is nominal data?

  Category data without scores
• How is nominal data often displayed?

  In bar charts or pie charts
• What is ordinal data?

  Data that can be ranked
• What is a key characteristic of ordinal data?

  Intervals between ranks are unknown
• Why is ordinal data often subjective?

  Based on opinion and perception
• What is the difference between interval and ratio data?

  Ratio data has a true zero point
• What is required to measure interval/ratio data accurately?

  A piece of measuring equipment