Caso practico estaadistica 2.docx - Caso práctico Dada una población en la que se analiza la variable aleatoria ξ n(μ σ se desea estimar σ2 = v(ξ

Caso practico estaadistica 2.docx - Caso práctico Dada una...

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Caso práctico Dada una población en la que se analiza la variable aleatoria ξ: n (μ, σ), se desea estimar σ2 = v (ξ). Para ello se proponen tres estimadores: 1. Σ21 = s2x = ∑ (xi – ax)2 / n 2. Σ22 = s21 = ∑ (xi – ax)2 /(n -1) 3. Σ23 = d2x = ∑ (xi - μ)2/ n Cuestión: ¿cuál tiene menor e.c.m? Respuesta 1. Σ21 = s2x = ∑ (xi – ax)2 / n • Teoría de la probabilidad En una determinada empresa hay tres departamentos: departamento de marketing, departamento financiero y departamento de tecnología. Se efectúa una encuesta para decidir si se debería aceptar o no una oferta realizada por otra empresa, y que incumbe a todos los empleados. La siguiente tabla nos da los resultados de lo que han votado los empleados en función del departamento. Financiero Marketing Tecnología Total Si 5 2 6 13 No 3 7 6 16 Total 8 9 12 29 1. Calcula la probabilidad de que un empleado tomado al azar haya votado no en la encuesta. 2. Calcula la probabilidad de que un empleado sea de marketing sabiendo que ha votado no tenemos los eventos: m = "el empleado pertenece a marketing".
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