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For students writing a quantitative or mixed-methods proposal
The Sample Size & Power Analysis Workbook
Most students guess, then a committee member or an ethics board asks where the number came from. This workbook is the working surface for the calculation: 64 fill-in templates on large pages, and three studies worked from the first effect-size estimate to the finished justification paragraph.
By Dr. Rafiq Muhammad, MD, PhD · 129 pages · Large 8.5 × 11 in pages · Paperback $32.99 · ★★★★★ 1 reader reviews
What readers say
★★★★★ 1 reader review from Amazon
“The step-by-step G*Power walkthroughs and explanations of effect sizes help make topics that can otherwise feel overwhelming more manageable. I also appreciate the focus on sample size justification, which is an important part of developing a solid research methodology.”
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“How many participants do I actually need?”
“My committee asked where the number came from, and I didn't have a good answer.”
“I picked a round number because that's what other studies seemed to use.”
“G*Power gave me a number. I can't explain how it got there.”
It is a number you derive from four linked parameters, then justify in writing. Once you can show the effect size, the error rates and the power behind it, the question from your committee stops being a threat and becomes a paragraph.
How it works
From an effect size you can source to a paragraph a reviewer can check.
From the best evidence you can find, with a sensitivity range, not a hopeful guess.
Run the power analysis field by field, then allow for attrition and the people you must screen.
The paragraph for your proposal, your ethics application and your grant.
What you will have
Look inside
Every worked number is shown, so you can reproduce the figure before you trust your own. These are real pages; tap to enlarge. These are real pages. Tap to enlarge.
Is it for you?
Clinician-researcher, PhD from Karolinska Institutet, and author of the Mastering Research books and workbooks, used by graduate students from the research question to the viva. Every template in this book carries a supervisor sign-off line.
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Questions
It is free software from Heinrich-Heine-Universität Düsseldorf, and the book walks you through it field by field. The book is independent of its developers; you download the program yourself.
Partly. Chapter 12 shows how to justify a qualitative or mixed-methods sample by saturation and information power. If your study is wholly qualitative, that chapter is the part you need.
The book shows how to recognise the designs G*Power cannot size and where to take them. For complex or high-stakes designs, use a statistician.
No. The three worked studies are invented to demonstrate the method. Check every figure in current software for your own study.
Yes. The final chapter builds the sample-size paragraph for your proposal, your ethics application and your grant.
The Sample Size & Power Analysis Template Kit has every template from this workbook as a fillable PDF, including the justification paragraph templates: $19, instant download. The workbook adds the teaching and a completed example of each.
Derive it, inflate it for the real world, and write the paragraph that proves it.
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