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CI 152 Assessment 8

Reliability and Validity

Indicates that multiple judgments draw the same conclusion about how well someone has performed: judgment reliability
Indicates that multiple administrations of the same test provide similar scores each time: test-retest reliability
Indicates that the learners respond similarly to all related items: internal consistency reliability
The assessment is an adequate representation of the content area: content validity
Indicates that scores agree with another measure of the same characteristic performed with a different test: criterion validity
Indicates that one has measured the contruct/characteristic one claims to have measured: construct validity
Indicates that an instrument appears to be valid: face validity
Validity can be no better than reliability... if consistency is poor, what is measured doesn't matter since scores vary
One must determine reliability first and then... turn to validity
Scoring consistency: reliability
Validity refers to... whether one measures what one claims
What is the object of measurement? validity
What is reliability strengthen by? increasing the number of test items, improving the test environment, improving the quality of test items
If fatigue and time are not factors, longer tests yield... better reliability than short tests
To improve the testing environment you can: limit distractions, improve directions
How can test item quality be gauged? determining item difficulty and item discrimination
Symbolized by a "p" value: item difficulty
Symbolized by a "di" value: item discrimination
The number who scored the item correctly divided by the number who attempted the item: "p" item difficulty
Group one minus group 2 and divided by chosen group size: "di" item discrimination, di = (g1 – g2)/g
Ordinarily we expect difficulty values to range from: .4 (40% got the item correctly) and up.
An item that everyone scores correctly has a difficulty index of: 1.0
Difficulty has little meaning without... discrimination
We expect items to have discrimination values between: .2 and .7
What do negative discrimination values indicate? a flawed item that should be deleted
Created by: Neukay