Jerry is mowing his lawn. It takes him 1/4 of an hour to mow 6/20 of his yard. What portion of the yard does Jerry mow lper hour. HEL I HAVE 5 MINS

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.