Frank, the plumber, has 6 3/4 ft of pipe. he needs to divide it into pieces that are 1/4 ft long. how many 1/4-pieces of the pipe can frank make?

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.