Market researchers conducted a study comparing the salaries of mangers at a large nationwide retail store. The researchers obtained salary and demographic data for a random sample of managers. The researchers calculated the average salary of the men in the sample and the average salary of the women in the sample. They want to test if managers who are men have a higher average salary than mangers who are women. Assume that all conditions for inference have been met, comment about the most appropriate test statistics to be used and construct the null and alternative hypothesis using appropriate notations.