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8.19 Los siguientes datos representan la tarifa del servicio mensual en dlares, si el saldo en la cuenta de un cliente cae de- bajo

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8.19 Los siguientes datos representan la tarifa del servicio mensual en dlares, si el saldo en la cuenta de un cliente cae de- bajo del saldo minimo requerido de $1 ,500 para una muestra de 26 bancos con clientes con cuentas de deposito directo. BANK- 12 8 5 5 6 6 10 10 9 7 10 7 7 5 0 10 6 9 12 0 5 10 8 55 9 Fuente: "The New Face of Banking", Copywright 0 2000 por Consumers Union of U.S, Inc., Yonkers. NY 10703-1057. Adaprado con el permiso de Consumer Reports, junio de 2000. a. Construya un intervalo de confianza del 95% para la media poblacional de la tarifa en d61ares del servicio si el saldo de un cliente baja del saldo minimo requerido. b. Interprete el intervalo construido en el inciso a).

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