a) Calculate the mean, median and standard deviation of women's annual earnings in the sample. b) Calculate the mean, median and standard deviation of men's annual earnings in the sample.

c) Compare the annual earnings distributions of the two sexes using the skewness coefficient.

d) Using the Student's t test, determine whether the average annual earnings of women is statistically different from that of men at the significance level a = 0.05. We assumes that all test conditions are met. Present all steps of your approach and all the calculations made to arrive at the final result.