15 POINTS HELP We can interpret the area under the normal curve for an interval as (1) the probability that a randomly selected observation will lie in the interval or (2) the proportion of observations that lie in the interval. Which of these two interpretations do you prefer, and why? Explain.

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.