You are trying to determine whether male and female Central Bank employees having equal qualifications receive different salaries. The file P10_66.XLS contains the salaries (in thousands of dollars) for 9 male and 9 female employees. Assume salaries are normally distributed. 

a. Assuming that each row of data represents paired observations, and using a = 0.05, can you conclude that members of different genders are paid equally? Be sure to write down your hypotheses. 

b. How would you collect data to ensure that the observations are actually paired?