Refer to exercises 21 and 22, which asked whether variables were categorical or measure­ment variables. The variables are repeated below. In each case, if the variable is categorical, specify whether it is ordinal or nominal. If it is a measurement variable, specify whether it is an interval or a ratio variable. Explain your answers.
a. Years of formal education.
b. Highest level of education completed (grade school, high school, college, higher than college).
c. Brand of car owned.
d. Price paid for the last car purchased.
e. Type of car owned (subcompact, compact, mid­size, full-size, sports, pickup).