Suppose that the equation V=20.8x2−458.3x+3,500 represents the value of a car from 1964 to 2002. What year did the car have the least value?
(x=0 in 1964)

A
1965
B
1970
C
1975
D
1980

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.