Not yet answered Points out of 1.00 Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with o = 1.9%. A random sample of 10 bank stocks are selected with the sample mean of x = 5.38%. Suppose that for the entire stock market, the mean dividend yield is u = 4.6%. Do these data indicate that the dividend yield of all bank stocks is higher than 4.6%? Use a = 0.01. P Flag question Select one: a. At the a = 0.01, we reject the null hypothesis and conclude the data are not statistically significant. b. At the a = 0.01, we reject the null hypothesis and conclude the data are statistically significant.