[amp_mcq option1=”validity” option2=”accuracy” option3=”precision” option4=”All of the above E. None of the above” correct=”option4″]
The correct answer is: D. All of the above
Validity, accuracy, and precision are all measures of quality.
- Validity is the extent to which a measure accurately reflects the concept it is intended to measure. For example, a measure of intelligence that is highly correlated with academic performance is said to be valid.
- Accuracy is the extent to which a measure is free from error. For example, a measure of weight that is accurate to within 0.1 pounds is said to be accurate.
- Precision is the extent to which a measure yields consistent results. For example, a measure of blood pressure that yields the same result on repeated measurements is said to be precise.
All three of these qualities are important for a measure to be considered reliable and useful. A measure that is not valid is not measuring what it is supposed to measure, and so is not useful. A measure that is not accurate is not measuring the concept it is intended to measure with any precision, and so is not useful. And a measure that is not precise is not yielding consistent results, and so is not useful.
Therefore, all three of validity, accuracy, and precision are important measures of quality.