Each chef at "sushi emperor" prepares 15 regular rolls and 20 vegetarian rolls daily. on tuesday, each customer ate 2 regular rolls and 3 vegetarian rolls. by the end of the day, 4 regular rolls and 1 vegetarian roll remained uneaten.

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.