Identify the level of measurement (nominal, ordinal, interval, ratio) used in each of the following.

a. The eye colors of all fellow students in your statistics class

b. The ages (in years) of homes sold, as listed in Data Set 23 of Appendix B

c. The age brackets (under 30, 30–49, 50–64, over 64) recorded as part of a Pew Research Center poll about global warming

d. The actual temperatures (in degrees Fahrenheit) recorded and listed in Data Set 11 of Appendix B