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Evidence from research into stuttering seems to indicate that
One-tailed
A type of statistical test that predicts the direction of the expected difference or relationship.
Two-tailed
A test in statistics where the critical area of a distribution is two-sided and tests whether a sample is greater than or less than a certain range of values.
Zero-tailed
Refers to a type of hypothesis test in statistics where the area of interest is on one extreme end of the distribution curve, indicating whether a sample mean is either significantly higher or lower than the population mean.
Random Assignment
The use of random selection to assign research participants to experimental groups.
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