In a random sample of 500 students at the university, 135 of them were smokers. In a random sample of 450 employees at the university, 63 of them were smokers. Researchers want to know if the proportion of students who smoke is greater than the proportion of employees who smoke. Which of the 'big five' parameters is this scenario? a) One sample mean b) Independent, two sample means c) Two sample proportion d) One sample proportion e) Dependent, two sample means What is the value of the sample statistic