In 1:29:31, there is an example of ordinal data which is the letter grades in an exam (A, B, C, D, F). Why it is not discrete data? Isn't the magnitude between the A and B, B and C, etc.. fixed (5 marks)?
My understanding is that the difference in magnitude between A (100-90) and B (90-85) is 15 total points. The difference between B (90-85) and C (85-80) is 10 total points. Notice how there’s a difference in magnitude even though we’re going straight from A to B then C. Moreover, F carries almost 60 points if for example it represents all the scores below 60 and therefore it’s magnitude would be largely different compared to the other letter grades. For these reasons, I think it’s best to suggest that letter grades are an example of ordinal data.
