The number of fish in a lake is decreasing by 400 every year, as described by the function below. f(1)=8200

f(n+1)=f(n)-400
A. 6200
B. 6600
C. 7000
D. 7800

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.