Let y be a random variable representing dividend yield of bank stocks. We may assume that , has a normal distribution with a - 1.8%. A random sample of 10 bank stocks gave the following yields (in parcants). 5.7 4.8 6.0 4.9 4.0 3.4 6.5 7.1 5.3 6.1 The sample mean is * = 5.30%%. Suppose that for the entire stock market, the mean dividend yield is , = 5,0%, Do these data indicate that the dividend yield of all bank stocks is higher than 5.0%67 Use a = 0.0: (a) what is the level of significance? State the null and altamate hypotheses. Will you use a laft-tailed, right-tailed, or two-tailed test? O Mi A = SWIM: