As a brand new employee, John received a handbook during orientation to help him understand the corporate culture of the firm. The last line of the company's mission statement said "Do unto our customers as you would have them do unto you." The company is promoting the use of , fill in the blank, to gauge ethical decision making in an employee's daily interaction with customers.

Using a cps-sample of 7,440 individuals, you estimate the following regression: = 20.91 - 2.61 x female where female is a binary variable that takes on the value of 1 for females and is 0 otherwise. the standard error on the coefficient on female is 0.25. the 95% confidence interval for the gender wage gap, or the amount that females earn less, is: a) [-3.10, -2.12] b) [18.30, 23.52] c) [-3.02, -2.20] d) [-1.96, -1.64]