In a Study on the Effects of Caffeine on Memory

question 25

Multiple Choice

In a study on the effects of caffeine on memory, participants drank a bottle of tasteless water containing 100, 50, or 0milligrams of caffeine. Neither the researcher who handed outthe bottled water nor the study participants knew whether the water contained caffeine or not. This is an example of a _____study.

• A)correlational
• B)case
• C)single-blind
• D)double-blind

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Definitions:

Political Liberals

Individuals or groups advocating for progressive reforms, emphasizing personal freedoms, and supporting policies for social and economic equality.

Income Inequality

The unequal distribution of income among individuals or households within a society or country.

Technological Change

Innovations or improvements in technology that enhance productivity or efficiency in the production of goods and services.

Negative Income Tax

A welfare system within which individuals earning below a certain amount receive supplemental pay from the government instead of paying taxes.