Acompany that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola is 40 milligrams. you want to test this claim. during your tests, you find that a random sample of thirty 12-ounce bottles of cola has a mean caffeine content of 42.3 milligrams. assume the population is normally distributed and the population standard deviation is 7.1 milligrams. at alphaequals0.04, can you reject the company's claim