1. With an interval scale,is it proper to consider that an increase of 20 points is twice as much as an increase of 10 points? Explain.
2. Assume that the following series of numbers form an interval scale: 0, 1, 2, 3, ..., 19, 20.
(a) Would it still be an interval scale if we added 10 points to each score? Explain.
(b) Would it still be an interval scale if we multiplied each score by 10? Explain.