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Results
#1. A BCBA designs an experiment to investigate the causal effect of a specific social gesture on relationship dynamics. The study’s independent variable is ‘boyfriends providing flowers to their girlfriends at the end of each week,’ and the dependent variable is ‘the girlfriends’ reported opinion of their boyfriends’ over a one-month period. The BCBA carefully instructs three participating couples on the precise experimental protocol. However, upon reviewing the implementation, the BCBA discovers that one of the boyfriends, in addition to the weekly flowers, has also been consistently bringing chocolates to his girlfriend. What specific experimental design issue has this unplanned action primarily introduced into the study?
Procedural fidelity refers to the extent to which an independent variable is implemented exactly as planned and described in the experimental protocol In this scenario the planned independent variable was flowers The introduction of chocolates by one boyfriend represents an unplanned unauthorized deviation from the established procedure This directly threatens procedural fidelity because the intervention is no longer being delivered consistently across all participants as intended Such a deviation makes it difficult if not impossible to confidently attribute any observed changes in the dependent variable girlfriends opinions solely to the flowers as the chocolates introduce an uncontrolled extraneous variable also known as a confound While this situation does introduce a confound the direct consequence of the boyfriends action is the failure to adhere to the prescribed procedure External validity concerns the generalizability of findings which cannot be adequately assessed until internal validity the extent to which the intervention and not extraneous variables caused the effect is established Measurement artifacts pertain to errors or biases in how data is collected which is not the primary issue here the issue is with the consistent delivery of the independent variable itself The action certainly does not eliminate confounds rather it introduces one
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