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Instrument, Validity, Reliability

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❶After the study, they are asked how the pictures made them feel, and they respond that the pictures were very upsetting. Internal validity - the instruments or procedures used in the research measured what they were supposed to measure.

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2 kg 7 pounds) than the placebo group (4. 1 kg 9 pounds). The researchers also looked at body fat percentage. The placebo group lost 2. 16, while the group taking Garcinia Cambogia lost only 1.

What is Reliability?

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Validity encompasses the entire experimental concept and establishes whether the results obtained meet all of the requirements of the scientific research method. For example, there must have been randomization of the sample groups and appropriate care and diligence shown in .

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Issues of research reliability and validity need to be addressed in methodology chapter in a concise manner. Reliability refers to the extent to which the same answers can be obtained using the same instruments more than one time.

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Construct validity is the term given to a test that measures a construct accurately and there are different types of construct validity that we should be concerned with. Three of these, concurrent validity, content validity, and predictive validity are discussed below. Concurrent Validity. On one end is the situation where the concepts and methods of measurement are the same (reliability) and on the other is the situation where concepts and methods of measurement are different (very discriminant validity).

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Define reliability, including the different types and how they are assessed. Define validity, including the different types and how they are assessed. Describe the kinds of evidence that would be relevant to assessing the reliability and validity of a particular measure. Different methods vary with regard to these two aspects of validity. Experiments, because they tend to be structured and controlled, are often high on internal validity. In contrast, observational research may have high external validity (generalizability) because it has taken place in the real world. Relationship between reliability.