Dr. Gabriel conducted an investigation to compare the effectiveness of Acceptance and Commitment Therapy (ACT) delivered via a gamified smartphone application against traditional one-on-one clinical consultations for managing obsessive-compulsive disorder (OCD) symptoms. He posted recruitment notices on a specialized OCD support forum on Reddit, asking individuals who wanted to participate to complete an online registration form.
His participants had been diagnosed with OCD of varying severities. They were allocated to one of two groups:
After a four-week trial, Dr. Gabriel assessed whether their obsessive thoughts and compulsive behaviors had improved, stayed the same, or worsened.
Explain one weakness of Dr. Gabriel using a volunteer sampling technique in his investigation.
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