2, 6, 18,
find the common ratio of the given sequence, and write an exponential function which represents the sequence. use n = 1, 2, 3,

a) 3; f(n) = 2(3)n-1

b.) 1/3; f(x) = 2(3)n-1

c) 3; f(n) = 2(1/3)n-1

d). 1/3; f(n) = 2(1/3)n-1

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.