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EJERCICIO TÉCNICAS DE PROYECCIÓN
Una estimación de la demanda de puertas metálicas (Y) sobre los precios de sus insumos (X2) es:
Y = 3.5 + 1.3X2 con R2 = 0.9657 n = 28 2 = 0.15
Se decide incluir una nueva variable (X3), la Tasa de Crecimiento del sector demandante, con lo que se obtiene:
Y = 4.25 + 1.8X2 - 0.5X3 con R2 = 0.97888 n = 28
Determine si la variable incluida es significativa
DESARROLLO
Ho : 3 = 0
H1 : 3 " 0
F = (R2 nuevo - R2 viejo) / nº de regresores nuevos
R2 nuevo) / n - nº de parámetros modelo nuevo
F = (0.97888 - 0.9657) / 1 = 15.601
(1 - 0.97888) / 28 - 3
t calc = "15.601 = 3.95
t tabla = t(25 ; 0.975) " 2
Por lo tanto se rechaza la Hipótesis Nula; con un 5% de significancia, podemos afirmar que la Variable introducida al modelo es significativa.
UNIVERSIDAD DE SANTIAGO DE SANTIAGO DE CHILE
FACULTAD DE ADMINISTRACION Y ECONOMIA
INGENIERIA COMERCIAL
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Enviado por: | Carolina Castro |
Idioma: | castellano |
País: | Chile |