What is the fully factored form of 32a3 + 12a2? 4a2(8a + 3) 4a(8a2 + 3a) 12a2(3a + 1) 12a(3a2 + a)

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.