How do you represent an union set on a Venn diagram??

Find the value of the cosine for angle a

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

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.