Trey’s class is making a school flag. The design for the flag is a rectangle that is 18 inches by 14 inches. They are planning to sew a ribbon along both diagonals of the flag. How long should the
piece of ribbon be?

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.