How much will you have to invest to have 6,000 in 4 years 3 months at 4 1/5% annual interest, compounded monthly?
a- $5,020.71
b- $1,016.90
c- $4,957.33
d- $7,185.50

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.