O conjunto dos numeros naturais [N] voce conhece desde pequenininho. O conjunto dos numeros inteiros [Z] e uma aplicaçao dele e esta ampliaçao veio com algumas novidades. Quais diferenças voce reconhece entre os numeros naturais e os numeros inteiros quanto ao : .Tipo do numero? . Modo de fazer calculos com eles ?

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.