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Es desitja estudiar el pes dels paquets d'un producte produts per una mquina. Se sap que la poblaci estudiada s normal amb valor esperat desconegut

Es desitja estudiar el pes dels paquets d'un producte produts per una mquina. Se sap que la poblaci estudiada s normal amb valor esperat desconegut i desviaci estndard igual a 200 grams. S'extreu umna mostra aleatria de grandria 25 i s'obt que la mitjana mostral s igual 1050 grams. Si incrementa la mida mostral a 35, l'amplada de l'interval a. disminueix, ceteris paribus b. incrementa, independentment del nivell de confiana c. incrementa, independentment de la desviaci estandard de la poblacio d. incrementa, perqu al disposar de ms mostra incrementem la confiaa

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