Which of the following is an example of an interval level measure?

An interval level measure is characterized by having meaningful intervals between values, where the difference between any two values is significant and consistent, but there is no true zero point. Temperature is a prime example of an interval level measure because it allows for the quantification of temperature differences. For instance, the difference between 30 degrees and 40 degrees Celsius is the same interval as between 70 degrees and 80 degrees Celsius, making it possible to perform arithmetic operations such as addition and subtraction on these values.

In contrast, the other options do not fit this classification as closely. Income is a ratio measure because it has a true zero (no income) and allows for comparison of ratios. Age, while it can seem like it fits, is also more of a ratio measure since an age of zero represents a birth and can lead to meaningful ratio comparisons (e.g., someone who is 30 years old is twice as old as someone who is 15 years old). Race is a nominal measure, as it categorizes individuals without any inherent order or meaningful intervals.