Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with = 2.6%. 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 5.0%. Do these data indicate that the dividend yield of all bank stocks is higher than 5.0%? Use a = 0.01.