2/3 of a pizza was left over. A group of friends divided the leftover pizza into pieces each equal to of the
original pizza. After each friend took one piece, of
the original pizza remained. How many friends were
in the group?

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.