Approximately How Many Research Participants Would Be Required for 80

question 41

Multiple Choice

Approximately how many research participants would be required for 80% power for a study using the t test for dependent means (assume a one-tailed hypothesis with an expected medium effect size of .50) :

• A)12
• B)26
• C)33
• D)196

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Definitions:

Confidence Interval

A range of values, derived from the sample data, that is likely to contain the value of an unknown population parameter.

Standard Deviation

Indicates the dispersion or variability within a set of numerical values around their average.

Mean Balance

The average amount of money held in an account over a certain period.

T-test

A statistical test used to compare the means of two groups to determine if there is a statistically significant difference between them.