An Oak tree can grow at a rate of 2 feet per year. An Elm tree can grow as fast as 3 inches per month.
How much will each type of tree grow In 10 years?
An oak tree will grow 5 feet, and an arborvitae will grow 3.33 feet.
An oak tree will grow 20 feet, and an arborvitae will grow 30 feet.
An oak tree will grow 30 feet, and an arborvitae will grow 20 feet.
An oak tree will grow 3.33 feet, and an arborvitae will grow 5 feet.

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.