La divición de manufacturas de una empresa desea estimar el tiempo promedio que tardan los operadores de ciertas máquinas en realizar una tarea. Por experiencias anteriores se sabe que la desviación estándar del tiempo que tardan los operarios en finalizar una tarea es de 1.04 minutos. Se desea una estimación con un nivel de confianza de 95.0% y un margen de error de ±0.5 minutos. ¿Que tamaño debe tener la muestra? <!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:-536870145 1107305727 0 0 415 0;}@font-face {font-family:"Bookman Old Style"; panose-1:2 5 6 4 5 5 5 2 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:647 0 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; mso-bidi-font-size:10.0pt; font-family:"Times New Roman",serif; mso-fareast-font-family:"Times New Roman"; mso-font-kerning:14.0pt; mso-fareast-language:EN-US; mso-bidi-font-weight:bold;}.MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;}@page WordSection1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;}div.WordSection1 {page:WordSection1;}-->

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