Let be a random variable representing divide.., Let x be a random variable representing dividend yie

Let be a random variable representing divide.., Let x be a random variable representing dividend yield of Australian bank stocks. We may assume that x has a normal distribution with a = 2.3%. A random sample of 15 Australian bank stocks has a sample mean of x = 8.71%. For the entire Australian stock market, the mean dividend yield is u – 5.5%. Do these data indicate that the dividend yield of all Australian bank stocks is higher than 5.5%? Use a = 0.05. What is the value of the test statistic?