Determine the level of measurement for each of the variables:

Determine the level of measurement for each of the variables: Nominal, Ordinal, Interval - Ratio

               a) Number of people in family

               b) Percentage of university students who attend public school

               c) The rating of the overall quality of a textbook from excellent to poor

               d) Your annual income

               e) The presidential candidate you voted for

               f) Your age