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Threats to validity in a research study

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Hello, based on the attached paper, I need help elaborating:

1.
Validity:Internal
Validity:External

2.
Data Analysis: Identifying the data analyses performed
And the data analyses technique selection appropriateness to design.

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https://brainmass.com/business/operations-research/threats-to-validity-in-a-research-study-586347

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Validity:Internal

The internal validity in this study is predicated upon the size of subject population and the amount of time given for the data collection or experimental treatment. Because the population size only entails certain companies such as those concerned with employee turnover and the increased number of lawsuits as well as only 3 respondents from these organizations, threats to the internal validity exist for the study. To attempt to alleviate this threat, the study includes primary stakeholders in the sample population of those who will participate ...

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Threats to validity in a research study is examined.

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Reviewing Internal and external threats to validity

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