Intercambio ionivo

UNIVERSIDAD DEL VALLE FACULTAD DE INGENIERÍA Asignatura: Fundamentos de Estadística Profesor: Ivan Mauricio Bermúdez V.

TALLER No.1 ESTADÍSTICA DESCRIPTIVA

1. Conteste falso o verdadero segúnel caso: a. En una distribución simétrica se esperaría que los tres indicadores de tendencia se encuentren muy cercanos. ( ) b. La mediana es el mejor indicador de tendencia cuando el conjunto de datoscorresponde a una escala de medición del tipo ordinal. ( ) c. La estadística descriptiva se apoya en las leyes de la probabilidad para extender sus resultados al total de la población. ( ) d. Sedenomina parámetro a una característica medida sobre los elementos de una muestra. ( ) e. Se define como muestra a un subconjunto de elementos extraídos de una población de referencia. ( ) f. Un estimadores una característica medida sobre el total de los elementos de la población. ( ) g. La media aritmética es un buen indicador de tendencia central en presencia de datos atípicos. ( ) h. En el rangointercuartilico se acumulan alrededor del 50% de las observaciones. ( )

2. Del siguiente conjunto datos, cual presenta menor dispersión (justifique su respuesta): a. 7, 9, 9, 10, 11, 12, 14, 17, 20,90 b. 7, 9, 9, 10, 11, 12, 14, 17, 17, 17 c. 15, 16, 19, 18, 17, 19, 20, 21, 23 d. 100, 101, 104, 105, 103, 104, 105 e. 24, 23, 25, 28, 29, 30, 31

3. Un curso está dividido en dos grupos. Lascalificaciones del examen de Cálculo I, por grupos han aportado los siguientes resultados:
Grupo A B Número de alumnos 20 50 Nota media 3,2 4 Varianza 0,8 1,5

a. Calcule la nota media de todo elcurso b. ¿Cual grupo resultó ser más homogéneo en sus calificaciones?

4. A continuación se presentan los datos registrados que se obtuvieron de un estudio desarrollado por una compañía constructoracuando sometió a pruebas de calidad el concreto que emplea en sus edificaciones, midiendo la resistencia a la comprensión. Los resultados de las pruebas en kg/cm2 fueron:

a. Defina la variable de…

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