HESI Nursing Research II
HESI Nursing Research II ( 54 Questions)
While a study is in progress that is designed to analyze the effects of three types of assistive devices used by clients with Parkinson's disease when ambulating, a new walker is introduced to the market and several of the subjects begin using the new walker.
Based on this occurrence, which statement is accurate?
A measurement error does not seem to be the primary issue in this scenario. While improving randomization through a double-blind approach can enhance the study's internal validity, the core problem here is not a measurement error but the introduction of a new walker, which could introduce confounding variables.
While manipulation of the dependent variable can indeed pose a threat to external validity, it is not the primary concern in this case. The primary issue is the potential for confounding due to the introduction of a new walker, which affects the study's internal validity.
This is the correct answer. The introduction of a new walker is an external factor that was not controlled for in the study. It can introduce confounding variables that affect the study's internal validity. Therefore, a threat to internal validity has occurred.
Selection bias is not the primary issue here. The primary concern is the introduction of a new walker affecting the study's internal validity. Selection bias pertains to the process of selecting subjects and does not directly address the impact of the new walker on the study's validity.
Choice A rationale:
A measurement error does not seem to be the primary issue in this scenario. While improving randomization through a double-blind approach can enhance the study's internal validity, the core problem here is not a measurement error but the introduction of a new walker, which could introduce confounding variables.
Choice B rationale:
While manipulation of the dependent variable can indeed pose a threat to external validity, it is not the primary concern in this case. The primary issue is the potential for confounding due to the introduction of a new walker, which affects the study's internal validity.
Choice C rationale:
This is the correct answer. The introduction of a new walker is an external factor that was not controlled for in the study. It can introduce confounding variables that affect the study's internal validity. Therefore, a threat to internal validity has occurred.
Choice D rationale:
Selection bias is not the primary issue here. The primary concern is the introduction of a new walker affecting the study's internal validity. Selection bias pertains to the process of selecting subjects and does not directly address the impact of the new walker on the study's validity.