26. Calculate the standard error of a sample mean for a sample with 121 observations where the standard deviation of the population is 484. (A) 0.25 (B) 4 (C) 5.5 (D) 22 (E) 44 27. A random sample of 64 individuals shows an average income of $70,000 per year. We know from previous research that the standard deviation for income is $21,025. I hypoth- esize that the true population mean for income is $68,550 per year. What is the absolute value (positive magnitude) of the z-statistic for this hypothesis? (A) 0.0017 (B) 0.3044 (C) 0.5517 (D) 0.6623 (E) 0.8395