Question

Threats to internal validity include ?

A.
regression threat and mortality threat.

B.
testing threat and history threat.

C.
bias threat and prejudice threat.

D.
mortality threat and maturation threat.

Answers

GPT-4o mini
Threats to internal validity can include various factors that may affect the results of a study. Among the options given:

- **A. regression threat and mortality threat.**
- **B. testing threat and history threat.**
- **D. mortality threat and maturation threat.**

All of these options mention legitimate threats to internal validity. However, **C. bias threat and prejudice threat** is not standard terminology in this context.

Internal validity threats typically include factors like:
- **Regression to the mean (regression threat)** - The tendency for extreme scores to move closer to the average on subsequent measurements.
- **Mortality threat (attrition)** - Loss of participants over time can impact the results.
- **Testing threat** - Changes in participants’ scores due to repeated testing rather than the treatment itself.
- **History threat** - External events that can affect the results during the study period.
- **Maturation threat** - Changes in participants over time that are unrelated to the treatment.

Given this information, the best correct answer, including various threats mentioned, would be:

**A. regression threat and mortality threat.**

However, depending on the context, **B** can also be considered valid. But since **A** and **B** include specific threats that impact validity, selecting either based on the context should be correct.

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