What Important Assumption Is Required of the A-B-A Withdrawal Design

question 16

Multiple Choice

What important assumption is required of the A-B-A withdrawal design in order to rule out rival hypotheses?

• A) that single participants will cooperate with long-term observations
• B) that the participant actually believes that the treatment will have an effect
• C) that the effects of the treatment are reversible upon withdrawal
• D) that the observation of the behavior is valid

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Definitions:

Wilcoxon Signed Rank Test

A nonparametric test used to compare two paired groups to determine if their mean ranks differ.

Z-Statistic

A statistical measure that indicates how many standard deviations an element is from the mean of a distribution.

Rejection Region

The range of values for which the null hypothesis is rejected in hypothesis testing, indicating statistical significance.

Significance Level

A statistical term that determines the threshold at which a null hypothesis is rejected.