Which of the Following Threatens the Internal Validity of an Experiment

question 18

Multiple Choice

Which of the following threatens the internal validity of an experiment?

• A) Using an independent variable with more than one level.
• B) Failing to generalize the results outside the lab.
• C) Failing to assign participants randomly to conditions.
• D) Failing to use a random sample.
• E) Using more than one dependent variable.

---

Definitions:

Depreciation Expense

The allocation of the cost of a tangible asset over its useful life, representing how much of the asset's value has been used up during the period.

Net Capital Spending

The total expenditure on fixed assets less any sales of fixed assets.

Capital Gains

The profit from the sale of a property or an investment when the selling price exceeds the purchase price.

Marginal Tax Rates

The rate at which the last dollar of income is taxed, reflecting the portion of an incremental income that is paid in taxes.