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Estadistica 1

Estadistica 1

Seleccione una empresa que trafica públicamente y genere una base de datos utilizando Yahoo-Finance de los precios al cierre ajustados para el periodo de tiempo que comprende desde el 2 de enero de 2013 al 31 de diciembre de 2013. No se pueden seleccionar las empresas Microsoft y Google. Debe presentar la base de datos en un archivo de Excel y cada una de las preguntas debe presentarla en una hoja de ese archivo.  Con esa base de datos, responda a lo siguiente:

  1. Colocar los precios desde la fecha más vieja a la mas reciente.
  2. Obtener las tres medidas de tendencia central usando las correspondientes formulas en Excel.
  3. Asuma que los datos representan una muestra, determine la varianza y la desviación estándar usando las correspondientes formulas en Excel.
  4. Asuma ahora que los precios representan una población, calcule la varianza y la desviación estándar usando las correspondientes formulas en Excel.
  5. Genere la información anterior usando Data Analysis. Asuma que los datos son muestrales.
  6. Usando el Z-Score, determine si hay algún precio extremo. En caso de no haberlo, identifique el o los que están más alejados de la media muestral.
  7. Usando el Teorema de Chebyshev, determine entre cuáles dos precios está al menos el 75% de la totalidad.
  8. Asumiendo que los datos se comportan de manera simétrica acampanada, determine entre cuáles dos precios está el 68% de la totalidad.
  9. Identificando el coeficiente de asimetría, determine si el supuesto de la parte (h) es correcto. De no ser el caso, presente argumentos estadísticos para su respuesta.


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