An experimental design was used to study the effects of using three strategies to teach clients, recently diagnosed with type 1 diabetes mellitus, about insulin administration. The subjects were randomly selected for participation in each of the three experimental groups and the control group. A pre-test was administered, and at the end of three months, the same test was administered as a post-test. Which is the main threat to the internal validity of this study?
The possibility that the results cannot be replicated.
How long the subjects had been diagnosed with diabetes.
The sampling method used to select subjects for the groups.
The subject's history during the three months of the study.
The Correct Answer is D
A. Replicability relates to external validity, not internal validity.
B. Since subjects were recently diagnosed, duration is controlled; it is not a main threat here.
C. Random selection and assignment reduce sampling bias, so this is less of a threat to internal validity.
D. Events or experiences outside the study (history) during the three months could influence the subjects’ knowledge or behavior, posing a threat to internal validity by affecting post-test results independently of the intervention.
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Related Questions
Correct Answer is A
Explanation
A. This study involves manipulation of the independent variable (type of narcotic delivery) and measurement of the dependent variable (range of motion), fitting an experimental or quasi-experimental design.
B. This is a retrospective chart review, descriptive in nature, with no manipulation of variables.
C. This is an observational study where clients self-record actions; no variables are manipulated.
D. This qualitative study involves interviews and theme identification, with no manipulation of variables.
Correct Answer is C
Explanation
A. Initiating focus groups again repeats data collection rather than addressing intervention.
B. Surveying clients about preferences is useful but does not directly address the influence of cultural beliefs on behavior.
C. Encouraging culturally diverse nurses to deliver education can help bridge cultural gaps, making education more relatable and improving acceptance and utilization of health services.
D. Examining current methods is important but does not directly address cultural barriers identified in the study.
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