On a scale of 0 to 5, how engaged were you in class last week? 0, I missed most classes/I joined but wasn't paying attention to 5, I attended all classes and was pay attention and participating the whole class. *

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.