Dr. Aris investigated whether toddlers (aged 2–3 years) exhibit higher levels of cooperative clean-up behavior after hearing a story about helpful animals compared to a neutral story. He recruited his participants by approaching parents in a local public park on a Tuesday morning and asking if their children could take part immediately in a mobile play-lab parked nearby, utilizing an opportunity sampling technique.
Dr. Aris read the helpful animal story to the toddlers in Group A, while toddlers in Group B were read a neutral story. He then observed each child during a structured 5-minute clean-up session and recorded the number of toy blocks each child placed back into a storage box.
Explain one weakness of Dr. Aris using an opportunity sampling technique for his investigation.
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