Adrianna hires a carpenter at a rate of $12 per hour to tile and carpet her apartment. it takes the carpenter 1 hour to finish 8 square feet. she decides to give him a 18% tip. how much will adrianna be paying the carpenter in total?

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.