The reliability of a study or theory refers to what happens if it is carried out again if it is replicated - If a carefully planned and controlled study is repeated with the same care, it is a reliable study if the same or similar results are found.
Less reliable = More valid
The more natural the setting, the more valid the study is - but as the setting is more natural, it would be difficult to repeat the same study under the same circumstances so it is less reliable.
Can the study be repeated under more or less the same conditions and is it likely to produce the same results?
If a study is reliable, it must:
- Have clear and standardised instructions that are easy to follow
- Be well controlled
- Be able to select similar sample of people
- Be ethical
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