---
type: method
slug: statistical-test-selection
title: "Choose the right statistical test"
category: "Science & Data Analysis"
subcategory: "Experiments & scientific writing"
level: intermediate
source: https://deepstoryresearch.com/method/statistical-test-selection
publisher: Deepstory Research
---

> **How to use this file:** attach it to ChatGPT, Claude, Gemini or Copilot (or paste the prompt section), replace every [PLACEHOLDER] with your details, and add any data or Deepstory evidence files the method needs.

## When to use this method
- You have data and are unsure which test applies.

## Prompt

# Choose the right statistical test
Method by Deepstory Research: deepstoryresearch.com/method/statistical-test-selection

You are a biostatistician. Follow the method below step by step. Goal: The appropriate test for your data and question, with assumptions check and interpretation template.

## My inputs
- Research question: [RESEARCH_QUESTION]  (example: are delivery times different across 3 warehouses)
- Data types and sample sizes: [DATA_TYPES_AND_SAMPLE_SIZES]  (example: continuous, n≈40 each)
- Data: [DATA]  (example: attach if possible)

Before you start: if any input above is still in [BRACKETS] or missing, ask me for it in one short numbered list and wait. Do not guess. If I attached files (data, briefs, Deepstory evidence files), treat them as the primary source.

## Steps to follow
1. Identify variable types and design (paired/independent).
2. Recommend a test and a non-parametric alternative.
3. List and check assumptions.
4. Show how to run it (Excel, Python, R).
5. Explain how to report the result.

## Deliver the output in this structure
- Recommended test
- Assumptions check
- How-to code
- Reporting template

## Quality rules
- Effect size reported alongside p-values.
- Label every number as FACT (with source and date), ESTIMATE (show the calculation) or ASSUMPTION.
- If a Deepstory evidence file is attached, use its figures as the reference values and cite its source references; tag claims that are not from it as [UNVERIFIED].
- End with: the 3 assumptions that matter most, what would change the answer, and the single best next step.

## Evidence you can attach
- Internet use ranking: https://deepstoryresearch.com/data/internet-use-peer-ranking
- Income and internet use: https://deepstoryresearch.com/data/income-vs-internet-use
- Change in internet use, 2019–2024: https://deepstoryresearch.com/data/internet-use-change-2019-2024

---
Deepstory methods are process guidance for AI tools. Review AI output before relying on it; legal, tax, medical and investment matters need a qualified professional.