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QCM 7 M2020


Go to solution Solved by LuMaths,

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Posted

Bonsoiiiir !

Je ne comprends pas comment l'IC est calculé dans ce qcm ... je ne comprends pas d'où sorte les chiffres utilisés dans la correction 🤔

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Merci d'avance !!

  • Solution
Posted (edited)

Salut @torototo!

 

Oui, on dirait qu'il y a une erreur de rédaction, car on a bien:

IC95%\approx \left [ m-2\sqrt{\frac{s^{2}}{n}};m+2\sqrt{\frac{s^{2}}{n}} \right ]=\left [ 72-2\sqrt{\frac{81}{100}};72+2\sqrt{\frac{81}{100}} \right ] = \left [ 72-2\sqrt{\frac{9^{2}}{10^{2}}};72+2\sqrt{\frac{9^{2}}{10^{2}}} \right ] =\left [ 72-2\frac{9}{10};72+2\frac{9}{10} \right ] =\left [ 72-1,8;72+1,8\right ] =\left [ 70,2;73,8\right ] .

 

Est-ce que c'est bon pour toi?

Edited by LuMaths

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