Validity & Reliability

The degree to which an assessment accurately assesses the concept and/or skill we are attempting to measure.

• Reliability

• Validity

• Error Margin

What would be a good way to estimate the reliability of an assessment?

• Verifying that majority of students' scores are close to one another

• Checking to see if it makes a difference when the test is taken

• Calculating the distance between the highest and lowest student score

Refers to the level of consistency of an instrument and the degree to which the same results are obtained when the instrument is used repeatedly with the same individuals or group.

• Validity

• Reliability

• Variance

• Stabilization

This is an example of...

• Reliability but Not Validity

• Validity but Not Reliability

• Neither Validity or Reliability

• Validity and Reliability

This is an example of...

• Reliability but Not Validity

• Validity but Not Reliability

• Neither Validity or Reliability

• Validity and Reliability

This is an example of...

• Reliability but Not Validity

• Validity but Not Reliability

• Neither Validity or Reliability

• Validity and Reliability

Obtaining similar scores for the same group of people form repeatedly using the same instrument over and over is an indication of the instrument's ________.

• Standar Error of Measurement

• Test Norms

• Reliability

• Validity

A research instrument can be reliable, but not valid. True or False?

• True

• False

Validity is a concept that... (choose the best answer)

• Measures the consistency of the measurement taken under the study.

• Covers the the full range of the issue set for the study

• Measures the accuracy of the concept that it supposes to measure.