Feat: activité sur l'intervalle de confiance
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Bertrand Benjamin 2020-12-12 11:31:14 +01:00
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\documentclass[a4paper,10pt]{article}
\usepackage{myXsim}
\usepackage{wasysym}
\author{Benjamin Bertrand}
\title{Intervalle de confiance}
\date{Décembre 2020}
\tribe{Enseignements Scientifiques}
\newcommand\cours{%
\begin{bclogo}[barre=none, arrondi=0.1, logo=]{Cours: Intervalle de confiance}
\begin{minipage}{0.6\linewidth}
On cherche à estimer $p$ la proportion d'un caractère d'une population. Pour cela, on fait un échantillon de $n$ individus de cette population et l'on calcule $f$ la fréquence (proportion) du caractère dans cet échantillon.
On peut définir \textbf{l'intervalle de confiance à 95\%}
\[
IC_{95\%} = \intFF{f - \frac{1}{\sqrt{n}}}{f+\frac{1}{\sqrt{n}}}
\]
Alors $p$ est dans cet intervalle avec une probabilité de 95\%.
\end{minipage}
\hfill
\begin{minipage}{0.3\linewidth}
\includegraphics[scale=0.6]{./fig/confiance}
\end{minipage}
\end{bclogo}
}
\begin{document}
\cours
\cours
\cours
\cours
\cours
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\documentclass[a5paper,10pt]{article}
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\author{Benjamin Bertrand}
\title{Intervalle de confiance}
\date{Décembre 2020}
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\setlength{\columnseprule}{0pt}
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\begin{document}
\maketitle
\begin{doc}{Deux phénotypes de lépervier strié}
% Issu du livre scolaire
Lépervier strié est un poisson qui vit dans les récifs coralliens. Il existe sous deux phénotypes : sombre et clair. Un recensement des formes claires et sombres a été effectué le long de cinquante-quatre transects, de la surface jusquau fond du lagon.
\begin{tabular}{|p{2cm}|p{2cm}|p{2cm}|}
\hline
Nombre de Poissons & Profondeur < 5m & Profondeur > 5m \\
\hline
Sombre & 538 & 20 \\
\hline
Clairs & 310 & 238 \\
\hline
\end{tabular}
\medskip
Peut-on affirmer que les poissons sombres préfèrent vivre proche de la surface?
\end{doc}
\begin{doc}{Sondage d'élection}
Deux candidats se présentent à une élection. Un sondage est commandé pour chercher à prédire les résultats. Il est fait sur 1302 électeurs. 629 déclarent qu'ils projettent de voter pour le candidat A et le reste pour le candidat B.
\medskip
Peut-on affirmer que le candidat $A$ a aucune chance d'être élu?
\end{doc}
\begin{doc}{Compétition entre établissements}
Trois établissements scolaires revendiquent être les meilleurs pour préparer leurs élèves au bac. Voici leurs résultats pour l'année dernière.
\begin{tabular}{|c|c|c|}
\hline
Nombre d'élèves & Reçut & Refusé \\
\hline
Lycée A & 40 & 13 \\
\hline
Lycée B & 87 & 36 \\
\hline
Lycée C & 140 & 16 \\
\hline
\end{tabular}
\medskip
Peut-on affirmer qu'un établissement est meilleur qu'un autre?
\end{doc}
\end{document}

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@ -33,10 +33,17 @@ Simulation de la variation de la taille de la population trouvée avec cette mé
Estimation d'une proportion d'une population avec l'échantillonnage.
.. image:: ./4B_confiance.pdf
:height: 200px
:alt: Cours sur l'intervalle de confiance
.. image:: ./4E_confiance.pdf
:height: 200px
:alt: Documents pour travailler l'intervalle de confiance
Étape 4: Hardy-Weinberg
=======================
.. image:: ./3E_Hardy_Weinberg.pdf
:height: 200px
:alt: Étude du modèle d'équilibre de HW