QUESTION 11 A labor union claims that the mean income of its members is no more than $20,000 per year. The Employers' Association believes that this claim is too low and that the actual mean income is higher. A random sample of 64 union members yields a mean income of $20,278.50 with a standard deviation of $793.81. Calculate the test statistic for the sample mean. O Ho: H = 20,000 Ha: H # 20,000 O HO: H 20,000 O HO: H 2 20,000 Ha: H 20,000