A consumer protection group randomly checks the volume of different beverages to ensure that companies are packaging the stated amount. Each individual volume is not exact, but a volume of iced tea beverages is supposed to average to 300 ml with a standard deviation of 3 ml. The consumer protection group sampled 20 beverages and found the average to be 298. 4 ml. Which of the following is the most restrictive level of significance on a hypothesis test that would indicate the company is packaging less than the required average 300 ml? upper-tail values a 5% 2. 5% 1% critical z-values 1. 65 1. 96 2. 58 1% 2. 5% 5% 10%.