Approximately what is the median success score for those in the hypnosis group who did not want to quit? 
Definitions:
Internal Validity
The degree to which a study or experiment accurately establishes a cause-effect relationship without the influence of external factors.
External Validity
The extent to which the results of a study can be generalized to other situations, people, settings, and times.
Experimental Design
The planning of an experiment to ensure that it can test hypotheses effectively and produce valid and reliable results.
Attrition
The loss of participants during the course of a study, which can potentially bias the results.
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