A survey conducted by a local real estate agency asked respondents to indicate whether they preferred natural gas, electric, or oil furnaces for heating their home. The data collected for this variable would be of ordinal level

The United States requires employers to give their employees how many paid vacation days and holidays?

A. 3 weeks. B. 5 days. C. 0 days. D. 5 weeks.

The evaluation of field workers should be based on which of the following criteria?

A) cost and time B) response rates C) quality of the data D) all of the above