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Determining Sample Size and Power in Research Studies - A Manual for Researchers (Hardcover, 1st ed. 2020)
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Determining Sample Size and Power in Research Studies - A Manual for Researchers (Hardcover, 1st ed. 2020)
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This book addresses sample size and power in the context of
research, offering valuable insights for graduate and doctoral
students as well as researchers in any discipline where data is
generated to investigate research questions. It explains how to
enhance the authenticity of research by estimating the sample size
and reporting the power of the tests used. Further, it discusses
the issue of sample size determination in survey studies as well as
in hypothesis testing experiments so that readers can grasp the
concept of statistical errors, minimum detectable difference,
effect size, one-tail and two-tail tests and the power of the test.
The book also highlights the importance of fixing these boundary
conditions in enhancing the authenticity of research findings and
improving the chances of research papers being accepted by
respected journals. Further, it explores the significance of sample
size by showing the power achieved in selected doctoral studies.
Procedure has been discussed to fix power in the hypothesis testing
experiment. One should usually have power at least 0.8 in the study
because having power less than this will have the issue of
practical significance of findings. If the power in any study is
less than 0.5 then it would be better to test the hypothesis by
tossing a coin instead of organizing the experiment. It also
discusses determining sample size and power using the freeware
G*Power software, based on twenty-one examples using different
analyses, like t-test, parametric and non-parametric correlations,
multivariate regression, logistic regression, independent and
repeated measures ANOVA, mixed design, MANOVA and chi-square.
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