Design and analyse an A/B test for Finance & Banking

Not professional advice. This prompt helps you draft finance & banking work faster. What the assistant writes is not financial or tax advice: have a qualified professional check it before anyone relies on it.

Your prompt is ready 4 brackets to fill

You are an experimentation specialist, working with retail customers, analysts and compliance officers at a bank offering retail and business accounts.

## Goal
Plan an A/B test properly and interpret the results without fooling yourself.

## What matters in Finance & Banking
- Numbers that matter: customer churn; cost-to-income ratio; net interest margin; NPA or default rate; CASA ratio; customer acquisition cost; fraud loss rate; NPS.
- Tools commonly used: core banking system; CRM; loan origination system; mobile banking app; BI dashboards and Excel.
- Rules and standards that usually apply: KYC and AML/CFT rules; central-bank regulation (RBI in India, the Fed and OCC in the US, the FCA in the UK); fair-lending and consumer-protection rules; PCI DSS for card data; required risk disclosures; never promise guaranteed returns.
- Rules differ by country. If I have not said where I work, ask me, and do not present one country's law as if it applied everywhere.

## What I will give you
- What you want to change: [CHANGE]
- Main metric: [METRIC]
- Current baseline and traffic: [NUMBERS]
- Results if the test is done: [PASTE RESULTS]

## What to do
1. Write the hypothesis.
2. Calculate the sample size and test length.
3. Define guardrail metrics.
4. If results are given, test significance and explain the result.
5. Recommend whether to ship, iterate or stop.

## What to deliver
- Test plan
- Sample size calculation
- Results analysis
- Recommendation

## Rules
- Keep KYC and AML regulation, audit trails and data security in mind throughout, and point out anything in my plan that would break them.
- Where it fits, connect your recommendations to customer churn and cost-to-income ratio.
- Use plain language and short sentences. Use headings and tables where they make the answer easier to scan.
- Do not invent figures, laws, sources or quotes. Mark anything you had to assume with "Assumption:".
- If something important is missing, ask me up to 3 short questions before you start.

## Before you answer
Check your draft against this list and fix anything that fails:
- Every number comes from my data or is marked as an assumption, and correlation is never presented as cause.
- It is written for a bank offering retail and business accounts; nothing in it would read the same for any other business.
- Every item under "What to deliver" is included.

Open in ChatGPT Claude Perplexity

How to use this prompt

Copy the prompt. Press Copy prompt and the full text goes to your clipboard.
Fill the brackets. Use the form above, or replace [CHANGE], [METRIC], [NUMBERS], [PASTE RESULTS] with your own details.
Paste and send. Paste it into ChatGPT, Claude, Gemini and DeepSeek and send. Ask follow-up questions to refine the answer.

Why this prompt works

The “Design and analyse an A/B test” prompt tells the assistant exactly what to hand back: test plan; sample size calculation; results analysis; and recommendation. It makes the assistant work through 5 steps in order, starting with "write the hypothesis", instead of jumping straight to an answer. Before replying, the assistant checks its draft against 3 tests and fixes anything that fails.

This version is written for a bank offering retail and business accounts, so the assistant keeps KYC and AML regulation, audit trails and data security in mind and judges the result by customer churn and cost-to-income ratio. If an important detail is missing, it asks you up to 3 short questions before it starts.

How to get the best answer

Fill every bracket with real detail: [CHANGE], [METRIC], [NUMBERS] and the rest should hold real names, numbers and dates, not placeholders.
Paste real material: where the prompt asks for notes, data or text, paste the actual content rather than a summary.
Refine in the same chat: ask "make it shorter", "turn it into a table" or "add more detail on step 2".
Check the result: review it against what you know about customer churn and cost-to-income ratio before you share it.

Other industries

Same prompt for other industries

The same design and analyse an a/b test prompt, rewritten for each industry.

FAQ

Frequently asked questions

Which AI assistant works best with the “Design and analyse an A/B test” prompt?

The “Design and analyse an A/B test” prompt works in any chat assistant and suits ChatGPT, Claude, Gemini and DeepSeek best. Paste it in, send it, and ask follow-up questions in the same chat to refine the answer.

What do I fill in before sending the “Design and analyse an A/B test” prompt?

Replace the 4 highlighted brackets – [CHANGE], [METRIC], [NUMBERS], [PASTE RESULTS] – with your own details. The more specific you are, the better the answer.

Is the “Design and analyse an A/B test” prompt only for Finance & Banking?

No. This version is written for a bank offering retail and business accounts, and the same prompt is also written for 15 other industries, listed on this page.

Is the “Design and analyse an A/B test” prompt free to use?

Yes. First AI Prompt prompts are free to copy and use in personal and business work, with no sign-up, no account and no daily limit.

Can I trust the answer the “Design and analyse an A/B test” prompt gives?

Treat it as a strong first draft: the prompt tells the assistant not to invent facts and to mark its assumptions, but check figures yourself and have a qualified professional review anything with legal, financial, medical or employment consequences.

Keep exploring