James wants to find out which football team is the most popular at a game between the home team and the visiting team. Which of the following methods will give him the most accurate results?

A. Survey every 5th person who enters the stadium gate.

B. Mail out a survey to all residents with the same zip code as the home stadium.

C. Survey every 10th person wearing visiting team colors.

D. Ask every 8th person who enters the grocery store the day before the game.

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.