Page 95 - DEDU504_EDUCATIONAL_MEASUREMENT_AND_EVALUATION_ENGLISH

Unit 7 : Reliability – Types , Methods and Usability

• Hoyt has defined reliability as follows : Notes
• “... total variation observed is conceived to be made up of three components, true inter-
individual differences, intra-individual differences (measured by item variance) and error
inter-individual differences.”
• The reliability of an assessment tool is the extent to which it consistently and accurately
measures learning.
• When the results of an assessment are reliable, we can be confident that repeated or
equivalent assessments will provide consistent results. This puts us in a better position to
make generalised statements about a student’s level of achievement, which is especially
important when we are using the results of an assessment to make decisions about teaching
and learning, or when we are reporting back to students and their parents or caregivers.

7.6 Keywords

Reliability : The State in that somebdy can rely on something or somebody.
Consistency : The quality of always behaving in the same way

7.7 Review Questions

1. Explain the meaning of reliability.
2. What are the different types of reliability ?
3. Give the methods of finding reliability.
4. What is the usability of reliability ?
Answers : Self Assessment

1. (i) Anastari, Consistency (ii) test retest reliability
(iii) internal consistency (iv) interrater
2. (i) T (ii) T (iii) F

7.8 Further Readings

1. Education Measurement and Evaluation : J.Swarupa Rani, Discovery Publishing
house.
2. Measurement and Evaluation in Teaching : Norman Edward Gronlund Macmillian
3. Measurement and Assessment in Teaching : Robert L. Linn Pearson Education
India.
4. Program Evaluation and performance measurement : James C. Me. David, Laura
R.L. Hawthorn, Sage Publications.

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