There are 19.3 cups of flour in a bag. Ricardo Ronaldo uses 2.95 cups for making cookies. Then, he uses 12.58 cups of sugar. How many cups of flour are left?

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.