Question

1. What is the different between reliability and validity? Give an example 2. What are some problems with the DSM and why are they problems?

Answer 1

• 1.Validity implies the extent to which the research instrument measures, what it is intended to measure.Reliability refers to the degree to which scale produces consistent results, when repeated measurements are made.
• A valid instrument is always reliable.A reliable instrument need not be a valid instrument.
• For example, if your scale is off by 5 lbs, it reads your weight every day with an excess of 5lbs. The scale is reliable because it consistently reports the same weight every day, but it is not valid because it adds 5lbs to your true weight. It is not a valid measure of your weight.
• Validity focuses on accuracy, i.e. it checks whether the scale produces expected results or not. Conversely, reliability concentrates on precision, which measures the extent to which scale produces consistent outcomes.
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