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Google search results:
1: https://www.formpl.us/blog/primary-data
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2: https://www.iwh.on.ca/what-researchers-mean-by/primary-data-and-secondary-data
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3: https://keydifferences.com/difference-between-primary-and-secondary-data.html
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4: https://libguides.umflint.edu/idinfosources/primarysecondary
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5: https://research.com/research/primary-research-vs-secondary-research
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6: https://libguides.macalester.edu/c.php?g=527786&p=3608639
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7: https://www.statisticshowto.com/experimental-design/primary-data-secondary/
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8: https://courses.lumenlearning.com/sociology/chapter/research-methods/
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9: https://quizlet.com/353896722/chapter-16-flash-cards/
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10: https://lacitycollege.libguides.com/primarysecondary
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11: https://books.google.com/books?id=KtZM299OY-gC&pg=PA52&lpg=PA52&dq=is+a+type+of+data+that+is+collected+by+researchers+directly+from+main+sources+through+interviews,+surveys,+experiments%0AO+primary%0AO+secondary%0AO+both+of+the+above%0AO+none+of+the+above&source=bl&ots=4evK7hmGRX&sig=ACfU3U2ZfdaYaD9fEK_4x92GYWs5DNITfQ&hl=en&sa=X&ved=2ahUKEwiJ17rei_z0AhXSHc0KHVCPB1sQ6AF6BAgxEAM
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