October 10, 2007 4:36 PM Subscribe
Statistics filter: Interval or Ordinal data?
posted by mjger to education (11 answers total)
Suppose a survey has the following question:
How old are you?
20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50+
You are to circle the range that you fit in.
Is the data collected from this question ordinal or interval? My first thought was ordinal, but then the intervals are all the same except for the last one, 50+. Because of that 50+ I still think ordinal. What if I got rid of that 50+ option, would the data collected then be interval? Am I on the right track?
Next question. If the data is ordinal is it appropriate to calculate the standard deviation? What about the variance?
Thanks for your help. If you need me to clarify my questions please ask.