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CHAPTER FOUR Qualitative Research 39 R esearch methods that delve deeply into experiences, social processes, and subcultures are referred to as qualitative ...
For example, if a study using laboratory animals is planned with four treatment groups ( T =3), with eight animals per group, making 32 animals total ( N =31), without any further stratification ( B =0), then E would equal 28, which is above the cutoff of 20, indicating that sample size may be a bit too large, and six animals per group might be more appropriate. 
Morse, JM. (1991). "Strategies for sampling." In Qualitative Nursing Research: A Contemporary Dialogue (JM Morse, Ed.) Newbury Park, CA: Sage Publications, pp. 127-145.
Qualitative Data Analysis Software
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