{"id":"data2-per-open-day-normalization-sales","audience":"managers","category":"data","track":"data","technique":"verification","level":"intermediate","title":"Compare two weeks fairly when one had fewer open days","free":false,"task":"Sales dropped between two weeks but one week had fewer open days. Write exactly 3 labeled lines in plain text, under 80 words: Raw, Per open day and Takeaway. Raw shows the plain week-over-week percent change with the division, Per open day shows each week's average per open day and the percent change, and Takeaway is one sentence for the owner.","materialLabel":"Weekly sales (attached to your prompt automatically)","material":"Weekly sales - Stonebridge Furniture showroom\n\nWeek of Oct 27 to Nov 2: $70,000 in sales; open 7 days.\nWeek of Nov 3 to Nov 9: $55,000 in sales; open 5 days (closed Nov 6-7 for the annual inventory count).\n\nDefinitions:\n- Percent change = (this week - last week) / last week.\n- Average per open day = weekly sales / open days.\n\nNotes:\n- The owner saw the dashboard and asked, \"Why did sales fall 21% this week?\"\n- No promotions ran in either week.\n- Weekends are included in the open days.\n- Round percents to one decimal and per-day averages to whole dollars.","rules":[{"type":"plainText"},{"type":"maxWords","max":80}],"mistakes":[{"title":"Stopping at the raw drop","why":"The AI explains -21.4% as a real decline.","fix":"Add: \"Per open day: $10,000 vs $11,000, +10.0%.\"","checks":["r0"]},{"title":"Missing the closure cause","why":"The AI says 'a slow week' without the two closed days.","fix":"Add: \"Takeaway: closed two days for the inventory count.\"","checks":["r1"]},{"title":"No arithmetic","why":"The AI quotes percents with no divisions.","fix":"Add: \"Write each division out.\"","checks":["r2"]},{"title":"Leaving the format to chance","why":"The AI picks its own length and layout unless told the exact shape.","fix":"Add: \"Plain text, no bold or headings.\"","checks":["plainText"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total word limit and it often lands over it.","fix":"Cap each part instead, for example \"each line under 15 words.\"","checks":["maxWords"]}],"promptHints":[{"label":"Gives the three labels","patterns":["raw:","per open day:","takeaway:"]},{"label":"Asks for the raw math","patterns":["55,?000 ?- ?70,?000","21\\.4"]},{"label":"Asks for per-day math","patterns":["/ ?7","/ ?5","10,?000"]},{"label":"Asks for the cause","patterns":["closed","inventory"]},{"label":"Rules out extras","patterns":["no intro","nothing after"]}],"hint":"Unequal periods make raw comparisons unfair. Ask for the per-day math next to the raw number.","mission":"Why did sales fall this week?","musts":["Raw change shown","Per open day comparison","Takeaway for the owner"],"rubricLabels":["Raw shows ($55,000 - $70,000) / $70,000 = -21.4%","Per open day shows $70,000 / 7 = $10,000 and $55,000 / 5 = $11,000, a change of +10.0%","Takeaway is one sentence saying sales per open day actually rose 10.0%, and the weekly drop is because the showroom was closed two days for the inventory count, in exactly three lines labeled Raw:, Per open day: and Takeaway:"]}