Last year, Miguel opened an investment account with $5400. At the end of the year, the amount in the account had increased by 26.5%. How much is this increase in dollars? How much money was in his account at the end of last year?

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.