Mk 167

---
name: mk-167
description: "Meta Single-Variable Test Check. Use when you need risks of changing the audience and creative at the same time; apply this method to the specified inputs and verify the deliverable"
---

# MK-167｜Meta Single-Variable Test Check

For a regular chat, upload `packs/mk-167.md`; it includes the shared rules, this method, and required references

## Purpose

This Skill delivers: **Risks of changing the audience and creative at the same time**

Use actual tools and current official specifications to establish platform options and placement availability; old course screenshots do not establish current capabilities

## Required Inputs

Test design or actual change list, audience/copy/creative/placement by group, period, comparison metric and held conditions

## Method Steps

1. Do not change audience, copy, creative, and placements all at once, or the source of CTR differences cannot be identified
2. First fix the Persona/ad set and compare copy/creative directions; when testing audiences, use separate ad sets
3. The course provides no statistically significant sample size or automatic stopping rules; do not invent them as course methods

## Calculation and Interpretation

Verify current platform settings and available audiences; this catalog does not establish an existing account read/write integration

## Required Output Fields

| Order | Field | How to complete |
|---:|---|---|
| 1 | Original comparison question | Use the supplied source, calculation, or explicit unknown |
| 2 | Audience, copy, creative, and placement by group | Use the supplied source, calculation, or explicit unknown |
| 3 | Held conditions and simultaneous changes | Use the supplied source, calculation, or explicit unknown |
| 4 | Primary metric, denominator, and observation window | Use the supplied source, calculation, or explicit unknown |
| 5 | Confounds and comparable scope | Use the supplied source, calculation, or explicit unknown |
| 6 | Single retained change and revised design | Use the supplied source, calculation, or explicit unknown |
| 7 | Missing evidence and interpretation changes | Use the supplied source, calculation, or explicit unknown |

## Verification cases

**MK-167-A1 | CTR rises after both audience and creative change**

Expected: Retain the observed difference, withdraw attribution to creative alone, and redesign the comparison holding one factor fixed

## Method Sources

Original file: Meta廣告學程 101 讓AI幫你投出廣告

Source location: Advertising

Source basis: Derived from course material

Original URL: https://docs.google.com/presentation/d/19GaScd4rGE8V4iqPfemeK8-QAwbSIeOKGpB5OwwTMlo/edit

English translation of source excerpt retained in the master table:

> Meta Advertising Course