Which of the following demonstrates the
additive identity:
a. 5*1=5
5. 3+5=5+3
c. 4+ (6 + 8) = (4+6) +8
d. 9 + 0 = 9

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.