A Researcher Attempts to Study the Effects of Alcohol on Task

question 57

Multiple Choice

A researcher attempts to study the effects of alcohol on task performance. One factor is alcohol-alcohol treatment versus placebo control-and the other factor is task difficulty-easy versus difficult. If the researcher uses a completely repeated measures design with 15 participants per condition, how many participants will he need for the study?

• A)15
• B)30
• C)45
• D)60

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Definitions:

Correlation Coefficient

A statistical measure that calculates the strength and direction of a linear relationship between two variables on a scatterplot.

Numerical Index

A numerical representation or measurement, often used for comparing statistical data, assessing performance, or tracking changes over time.

Normally Distributed

Describes a statistical distribution where data points are symmetrically distributed around the mean, forming a bell-shaped curve.

Percentage

A portion of a whole expressed as a fraction of 100, used in quantifying proportions and ratios.