When Weighting the Effect Sizes of Studies with the Number

question 29

Multiple Choice

When weighting the effect sizes of studies with the number of participants in each study, ______.

• A) psychotherapy in children is no longer found to be effective
• B) psychotherapy in children is found to be even more highly effective.
• C) the average effect size is in the "moderate" rather than the "small" range
• D) the average effect size is in the "moderate" rather than the "large" range

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Definitions:

Median

The middle value in a sorted list of numbers, dividing the data set into two halves.

Trimmed Mean

This is a method of averaging that involves removing a certain percentage of the largest and smallest values before calculating the mean.

Bootstrap Confidence Intervals

A statistical technique that involves resampling with replacement to estimate the distribution of an estimator and compute its confidence intervals.

Small Samples

Refers to a group or set in a study that is limited in number, which may affect the statistical significance and generalizations.