presentation is descibing the charetristics of a good test

1. CHARACTERISTICS OF A GOOD TEST

2. •Objectivity
•Reliability
•Validity
•Norms
– These characteristics help to us to have faith in
the results obtained and conclusions drawn

3. OBJECTIVITY
•Inter-examiner variability=0

4. RELIABILITY
• Indices of reliability gives an indication of the
extent to which the scores of a test are
consistent and reproducible
• It indicates how accurately it measures what
it does measures .

5. • Observed score = true score + error score
Reliable Not Reliable
True core tr
True score
ERROR
SCORE
ERROR
SCORE

6. • If the errors fluctuate or error variance is
more it is a hindrance to reliability
• Constant error do not lead to inconsistency
so they do not affect the reliability

7. Ways for establishing reliability
• Repeat the test( test retest reliability)
• Administer a second equivalent form( parallel
form reliability)
• Subdivide the test into equivalent
fractions(split half reliability)

8. VALIDITY
• How well the test measures what it purports
to measure
• If the test measures what it intends to
measure it is said to be a valid test
• Denotes scientific utility of a measuring
instrument

9. Some facts about validity
• It is matter of degree and not all or none
property
• Validation is an unending process
• Most psychological test need to evaluated and
re-evaluated to check if they are behaving as
they should be
• One validates the use to which a measuring
instrument is put rather than the instrument
itself
• Test are often valid for one purpose but not for
another

10. instVALIDITY
LLOGICAL STATISTICAL
FACE CONTENT CRITERION-
RELATED
CONCURRENT PREDICTIVE
CONSTRUCT

11. NORMS
Average performance of a
representative sample

12. NEED
Norms are needed for –
Inter comparisons
Intra comparisons
Generalization
To estimate the standing of the individual in a
group

13. TYPES OF NORMS
• Age norm
• Grade norm
• Percentile
• Standard scores

15. REFERENCES
• Nunnally Jum. C. & Bernstein H. (2010).
Psychometric Theory. New Delhi: Tata Mc Graw
Hill
• Anastasi Anne & Urbina Susana.( 2007).
Psychological Testing. New Delhi: Pearson
Prentice Hall.
• Thorndike M Robert.( 8th Edition).Measurement
And Evaluation In Psychology And Education. New
Delhi: PHI Learning Private Limited .
• Kerlinger. Fred N.( 2nd Edition). Foundations Of
Behavioural Research. Surjeet Publications