1. A new apparatus has been devised to replace the needle in administering vaccines. The apparatus, which is connected to a large supply of vaccine, can be set to inject different amounts of the serum, but the variance in the amount of serum injected to a given person must not be greater than .08 to ensure proper inoculation. A random sample of 20 injections was measured and s2 = 1:1. Formulate appropriate hypothesis and test the hypothesis at 0.05 level based on the rejection region.