Reliability

Question 1

What is reliability?

Answer 1

the extent to which the outcomes are consistent when the experiment is repeated more than once

Question 2

What are the 2 types of reliability?

Answer 2

• internal reliability
• external reliability

Question 3

What is internal reliability?

Answer 3

• a measure of how consistently different items within a single test measure the same concept
  e.g questionnaires

Question 4

What method is a way of assessing internal reliability?

Answer 4

split half method

Question 5

What is external reliability?

Answer 5

• if the measure is consistent overtime or under different conditions
• e.g interviews

Question 6

What method is a way of assessing external reliability?

Answer 6

• test-retest

Question 7

How would issues with internal reliability be dealt with?

Answer 7

-Questions can be removed to see if the split half method returns a high reliability score.

Question 8

How would issues with external reliability be dealt with?

Answer 8

May occur due to questions being written poorly, causing confusion
-interviewer could be retrained

Question 9

What is inter-rater reliability?

Answer 9

• relevant in observational research
• more than one observer come together and compare results
• a correlation co-efficient of more than +0.8 between the observers is needed to be acceptable

Question 10

What is test-retest reliability?

Answer 10

• same p’s take the same test on different occasions
• high correlation=good external reliability
• 2 independent scores should be correlated
• correlation of +0.8= acceptable

Question 11

What is split half reliability?

Answer 11

e,g IQ test
- p’s test answers are split in half and compared
e.g even question compared to an odd
- if reliable answers across both will be consistent