Instrument effect

The instrument effect is an issue in experimental methodology meaning that any change during the measurement, or, the instrument, may influence the research validity.[1] For example, in a control group design experiment, if the instruments used to measure the performance of the experiment group and the control group are different, a wrong conclusion about the experiment would be reached, the research result would be invalid.[1]

References
  1. Larry B. Christensen (2007). Experimental methodology. Pearson/Allyn & Bacon. p. 377. ISBN 978-0-205-48473-7.
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