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Purposive sampling technique PSD

PSD a single photo of a colorimeter
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PSD a person is wearing gloves that say s syringe
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PSD gloved hands hold test tubes with pink flowers and seaweed underwater
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PSD gloved hands hold two clear liquidfilled vials
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PSD gloved hands carefully hold two test tubes containing different colored liquids in a laboratory setting
PSD scientist in lab coat meticulously handles test tubes and samples during research
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