Find the length of the curve x equals StartFraction y cubed Over 15 EndFraction plus StartFraction 5 Over 4 y EndFraction on 3 less than or equals y less than or equals 5.

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.