hard20 pts · first answer countsab-testingexperiment-design

What caused the lift

A product page test changed the layout, the photos, the price display and the button copy at once. Conversion rose 8%. The team wants to apply "the new button copy" everywhere. What is the problem?

A.The changes are confounded: you know the whole package won, but not which change caused it; isolate the copy in a follow-up test if it mattersB.An 8% lift is too small to matterC.Button copy never affects conversionD.Nothing; all four changes clearly helped equally

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