Check an AI's average order value across two stores

About this exercise

An AI said the average order value across two stores is $65 and you suspect it averaged the two averages. Write exactly 3 labeled lines in plain text, under 70 words: Verdict (Right or Wrong plus the reason), Correct math (the weighted calculation written out) and Why (one sentence for a non-analyst). Use only the numbers given.

Common mistakes when you ask AI for this

• Accepting the $65. The AI says the simple average is fine. Try: Add: "Check whether the stores should be weighted by order counts."
• Math without the sums. The AI gives $53 with no working. Try: Add: "Correct math: ($45,000 + $8,000) / (900 + 100) = $53.00."
• Jargon in Why. The AI explains 'weighted means' at length. Try: Add: "Why: one plain sentence, under 25 words."
• 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 three labels
• Asks for weighted math
• Asks for the verdict
• Asks for a plain why
• Limits the data

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