Decide whether a fading test lift is worth shipping

About this exercise

A test's lift shrank in week 2 and your VP wants a decision. Write exactly 4 labeled lines in plain text, under 100 words: Week 1, Week 2, Rule and Decision. Show each week's relative lift as (variant - control) / control, apply the written rule to the final week only, and make Decision start with Ship, Extend or Stop.

Common mistakes when you ask AI for this

• Shipping on week 1. The AI averages the weeks or ships on the +10% headline. Try: Add: "Judge the final week only."
• Absolute not relative. The AI reports 0.4 and 0.1 points but not the relative percents. Try: Add: "Relative lift = (variant - control) / control."
• Wrong verdict. The AI says Stop or Ship instead of Extend. Try: Add: "Above 0% but under 5% means Extend one more week."
• Leaving the format to chance. The AI picks its own length and layout unless told the exact shape. Try: Add: "Plain text, no bold or headings."
• Trusting the AI to count words. AI is bad at counting. Ask for a total word limit and it often lands over it. Try: Cap each part instead, for example "each line under 15 words."

What a strong prompt includes

• Gives the four labels
• Asks for relative lift
• Says final week only
• Gives the cut-offs
• Ignores Slack

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