The library at a certain university reported that journal prices had increased by 120% over a period of 10 years. The report concluded that this represented a price increase of 12% each year. If journal prices had indeed increased by 12% each year, what percentage increase would that give over 10 years? (Round your answer as a percentage to the nearest whole number.)

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.