Practice · Statistics Quest

Practise until it sticks

Choose a topic, a skill or a difficulty. Calculation exercises have new versions with fresh numbers once you have solved them, so you can practise the method rather than memorise an answer.

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Interpretation, difficulty 2 of 3

Significant but small

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An online retailer tests a redesigned product page on 10 million visitors (randomly split, 5 million per version). Conversion is 4.03% with the new page and 4.00% with the old one, and the difference is statistically significant. Redesigning all product pages would cost 3 million SAR. What should the analyst say?