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Prácticas Estadística I
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Prácticas Estadística I
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Estadística en Ciències del Comportament I (URV, Tarragona) L2 ANDREA TORRES BERBELTema Inferència: mitjana aritmètica
Exercici: 1
En una mostra s'han obtingut 30 puntuacions en un test d'Extraversió. Quin és
l'interval de confiança de la mitjana aritmètica a la població? (alpha = 0,05)
Solució numèrica:
Estadístics calculats Valor
N 30
Sumatori de Xi 1852
Sumatori de XiXi 114998
Mitjana aritmètica 61,7333
Variància (Sx2) 22,2622
Quasi-Variància (qSx 2) 23,0299
Sx 4,7183
Quasi-Sx (qSx) 4,7989
Se 0,8762
gl 29
alpha 0,05
t 2,0452
Límit inferior 59’9414
Límit superior 63’5253
Solució raonada: (59’9414,63’5253)
Exercici: 2
En una mostra de 21 estudiants s'ha administrat el test d'Ansietat Estadística (SAS). Es
pot acceptar que la mitjana aritmètica a la població és 64? (alpha = 0,05)
Solució numèrica:
Estadístics calculats Valor
N 21
Trainer for Statistical exercises
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