A one-group, pretest/posttest design differ from a pretest/posttest design, and which threats to internal validity are especially applicable to this design in a way because it only has one group and no comparison group.
The level of assurance that the causal relationship under test is reliable and unaffected by other variables or factors is known as internal validity. The degree to which research findings can be extrapolated (generalized) to different contexts, populations, or events is referred to as external validity.
Internal validity lends credibility to the researcher's results, which is what it accomplishes for research. When an experiment reveals a friendly relationship between two pieces of data, this is done. A high level of internal validity dispels any remaining questions about the study.
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