Researchers at the Consumer Product Testing Laboratory test samples of electronic surge protectors to find the voltage levels at which computers can be damaged. For each of the following, determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate.
a. The measured voltage levels that cause damage
b. Rankings (first, second, third, and so on) in order of quality for a sample of surge protectors
c. Ratings of surge protectors as "recommended, acceptable, not acceptable"
d. The room temperatures of the rooms in which the surge protectors are tested
e. The countries in which the surge protectors were manufactured