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Sampling Techniques: 

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http://www.csun.edu/~hbsoc126/soc4/chapter_8_outline.pdf 

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http://www.vkmaheshwari.com/WP/?p=2455

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https://scientificinquiryinsocialwork.pressbooks.com/chapter/10-3-sampling-in-quantitative-research/

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Power & Effect Size & Sample Size estimates: 

 

           Power & Effect size lecture: https://www.youtube.com/watch?v=9LVD9oLg1A0

           

G*Power: https://www.youtube.com/watch?v=HPKcmEhP-4s

 

Another estimates of sample size: https://www.qualtrics.com/experience-management/research/determine-sample-size/ 

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