This scale of measurement has equal intervals between the points ...

[yoroshambo]

This scale of measurement has equal intervals between the points on the scale and also has a true zero point, thereby making ratios meaningful.
 
  a. nominal c. interval
  b. ordinal d. ratio

Question 2

If the center response option is important, the researcher should provide an _____ number of response options (intervals) for bipolar items.
 
  a. even c. absurd
  b. odd d. relative

[Smiles0805]

Answer to Question 1

D
This defines the ratio scale.

Answer to Question 2

B
If an even number of items are provided, there is no item that is really in the center.