C(n) = -7 + 6(n - 1)c(n)=−7+6(n−1)c, left parenthesis, n, right parenthesis, equals, minus, 7, plus, 6, left parenthesis, n, minus, 1, right parenthesis Find the 4^\text{th}4 th 4, start superscript, start text, t, h, end text, end superscript term in the sequence.

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.