Resource centre
Practical guides to study design, analysis and business research, with a free sample size calculator. Use these resources to prepare a clearer research question and plan your next step.
Resource categories
- Explore
Survey planning
Calculate sample size and understand the assumptions behind it.
- Explore
Statistical guides
Connect your research question to an appropriate analysis.
- Explore
Business research
Use market evidence and scenarios to assess a proposal.
- Explore
Working with ezyStat
Scoping, pricing, data handling and common questions.
Sample size calculator
How many completed responses do you need to estimate a percentage with a given precision? Adjust the inputs and the result updates as you type.
Completed responses needed
1,068
- Base sample, n₀ = z²p(1−p)/e²
- 1067.1
- After design effect × 1
- 1067.1
This applies to estimating one proportion. Comparing subgroups, measuring change or estimating means needs a different calculation. Treat the result as a starting point for discussion, not a final design.
Practical research guides
Short, worked explanations of the decisions that come before a good analysis. Each guide includes further reading and a route to more detailed support.
- Survey design4 min read
How to determine sample size for a survey
Plan completed responses, allow for non-response, and understand what a margin of error can tell you.
Read the guide - Statistical guides4 min read
Choosing the right statistical test
Use the research question, outcome and study design to choose an analysis and report an interpretable result.
Read the guide - Research methodology3 min read
Market research versus feasibility studies
Understand demand, test the economics and decide what evidence you need before committing to a new venture.
Read the guide
Frequently asked questions
About working with ezyStat.
How do projects usually start?
Send a short description of your project through the enquiry form. We reply to arrange an initial conversation, then send a written proposal setting out the scope, method, timeline and cost.
How are projects priced?
Most work is priced per project after scoping, so you know the cost before work begins. Ongoing support and training can be arranged at an agreed daily or hourly rate.
Should I send my data with my enquiry?
Please send a general description of your question, without datasets or sensitive personal information. If a project goes ahead, we agree a secure way to transfer data and the terms under which it is handled.
Do you work with clients outside the UK?
Yes. We work with international clients remotely. Fieldwork outside the UK is arranged with qualified local partners, subject to project feasibility.
Will you write my thesis or assignment?
No. We provide consultancy, review and training so that you understand and can defend your own analysis, in line with your institution's academic integrity rules.
Which software will you use?
Usually R or Python. Where your organisation works in SPSS, Excel or Power BI, we can deliver in those tools so your team can maintain the work.
Have a research question or data challenge?
Tell us about your project and discover how ezyStat can help you design, analyse and interpret your data.