About data type

Answer 1

There are three types of data as followed in the corresponding order in their hierarchy:

1. Interval data
   • Values are real numbers
   • all calculations are valid
   • can be treated as ordinal or nominal
2. Ordinal data
   • Values must be represent the ranked order or the data
   • calculations based on the ordering process are valid
   • can be treated as nominal but not interval
   • Example: A rating scale where 1 represents Poor performance; 2 represents fair performance; 3 represents good performance; etc,
   • Values are the arbitrary numbers that represent categories
   • only calculationsn based on the frequencies of occurance are valid
   • cannot be treated as ordinal or interval
   • Example: 1 represents green; 2 represents red; 3 represents orange; (their average means nothing; the only numeric values that you can get is the count of how often it occurs)
3. Nominal Data