Factor completely
x^2+15x+50
(x - 5)(x - 10)

(x + 5)(x + 10)

(x - 5)(x + 10)

(x + 25)(x + 2)

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.