Back to: Chapter 12: Inference About a Population… > Chapter Lessons

2 thoughts on “Introduction (Preview)

  1. I’m still confused about how to determine whether the problem is nominal or interval ..i mean how can we figured its nominal data?

    1. Very simply, numerical data is interval and categorical (non-numerical) data is nominal. If I collect data on people’s salaries (numbers), then I have collected interval data. If I collect data on people’s nationalities (not numbers) then I have collected nominal data.

      More specifically, interval data is a bit more complicated than just being numbers – it must represent counts or measurements of some kind. So if I had a list of numbers where a ‘1’ represented ‘Female’ and a ‘2’ represented ‘Male’, then this would not be interval since these numbers do not represent counts or measures – instead it would be nominal data.

      Hope this helps!

Leave a Reply

Your email address will not be published. Required fields are marked *