Principles of Measurement

Question 2

Two Types of Measurement Variables

Answer 2

• Continuous Variables- Discrete Variables

Question 3

Describe Continuous Variables

Answer 3

Variable whose values are on a scale with a theoretically infinite number of measurable increments between each major unit *weight, strength, distance etc

Question 4

Describe Discrete Variables

Answer 4

Variable for which the value is a distinct category *heart beats, number of trials, number of children in the family, etc.

Question 5

Precision

Answer 5

refers the exactness of a measure

Question 6

4 Levels of Measurement

Answer 6

• Ratio- Interval- Ordinal- Nominal

Question 7

Describe a Ratio Measurement

Answer 7

Classifies objects or characteristics in rank order with a known equal distance between categories and a known empirical zero point *Height, weight, circumference, blood pressure, etc.

Question 8

Describe a Interval Measurement

Answer 8

Classifies objects or characteristics in rank order with a known equal distance between categories but lacks a known empirical zero point *Temperature, calendar year, etc.

Question 9

Describe a Ordinal Measurement

Answer 9

Classifies objects or characteristics in rank order but lacks the mathematical properties of a known equal distance between categories *Weight-bearing status, level of assistance needed, MMT grades, patient satisfaction, etc.

Question 10

Describe a Nominal Measurement

Answer 10

Classifies objects or characteristics but lack rank order and a known equal distance between categories *Gender, Race/Ethnicity, Religious affiliation, etc.

Question 11

3 Measures of Central Tendency

Answer 11

• Mean- Median- Mode

Question 12

3 Measures of Dispersion

Answer 12

• Rang- Standard Deviation- Variance

Question 13

What is variance?

Answer 13

The variability of a score within a distribution

Question 14

What is standard deviation?

Answer 14

The square root of the variance