There's an ad on TV for Plantur DMG shampoo that seems to say "91% of 30 women agreed." But you can't get 91% out of 30 without asking some weird fraction of a woman! 27 out of 30 would be 90%, and each additional woman is 3.33%. The small print mentions a control group, but I still can't see how these numbers make sense even for a tiny study intended to slap "90% agree!" on a product. Does anybody know? #Mathstodon #advertising #statistics #maths #study #Plantur #shampoo
Darf ich im Supermarkt am Shampoo riechen?
Am Shampoo schnupper oder kurz mal das Deo sprühen, um den Geruch zu testen. In der Praxis gang und gäbe – aber ist das überhaupt erlaubt?


