Si sa che una password deve essere composta da una sequenza di quattro
lettere (tra le 26 dell'alfabeto) seguita da tre cifre decimali. Calcola quante sono
le possibili password se il sistema è case sensitive e le cifre sonon esadecimali
(cioè in base 16). *

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.