At hockey practice , Coach Taylor always set aside 80% of the total time for game play. The rest of the practice is spent on the warm up. At practice yesterday, player spent 72 minutes on gameplay. The play wants to know the total practice time.

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.