How Can a Researcher Be Sure That Threats to Internal

question 32

Multiple Choice

How can a researcher be sure that threats to internal validity are being ruled out in the design?

• A) sorting out what threats are applicable in which settings
• B) comparing the results of several post-tests
• C) random selection will rule out, or greatly reduce the chances for statistical regression
• D) all the above

---

Definitions:

Marginal Benefit

The supplemental value or usefulness derived from using another unit of a good or service.

Marginal Cost

The increase in total cost that arises from producing one additional unit of a good or service.

Net Benefit

The total positive impact or gain subtracted by the total cost or negative impact, typically used in the analysis of business or policy decisions.

Marginal Benefit (MB)

The augmented satisfaction or usefulness obtained by consuming or producing one extra unit of a good or service.