Which two expressions BEST describe the total number of shell they have. Sally and her five friends collect seashells by the seashore. Each of them has conch shells and oyster shells. Let c represent the conch shells and y represent the oyster shells

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.