Classify each of the following variables according to the level (scale) of measurement (Nominal, Ordinal, Interval, and Ratio) that was used.

1			Number of wrong turns made by rat in a maze.
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
2			Time it takes a car to leave an intersection when the light changes.
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
3			Self-reported level of frustration using a 7-point scale (1 = not at all frustrated; 7 = extremely frustrated).
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
			E)	Ordinal and Interval
4			Whether or not a person uses a self-referent ("I," "me," "we," or "us") in a 10-minute conversation.
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
5			Scores on a paper-and-pencil test measuring depression (responses for each item are made on a 0-4 scale and then all responses are totaled; maximum score is 100).
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
6			Student's ranking of 5 topics in terms of his/her relative knowledge of the topics (ranked from "most" to "least" knowledge).
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
7			Child's choice of "ugly toy" or "pretty toy."
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
8			Students' class standing as a function of Grade Point Average.
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
9			The number of times a person looks away from a book he or she is reading.
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
10			Observers' judgments regarding the aggressiveness of children's playground behavior on a 1 - 10 scale.
			A)	Nominal
			B)	Ordinal
			C)	Interval
			D)	Ratio
			E)	Ordinal and Interval