Question: If an unplanned event occurs while an experiment is being conducted and affects the results, this is referred to as _____, and it is a

If an unplanned event occurs while an experiment is being conducted and affects the results, this is referred to as _____, and it is a threat to the interpretation of the results.

a. experimenter effects b. history c. instrumentation d. maturation e. multiple treatment interference f. none of the above

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