Question: NFL Salaries. An agent claims that there is no difference between the pay of safeties and linebackers in the NFL. A survey of 15 safeties found an average salary of $501,580, and a survey of 15 linebackers found an average salary of $513,360. If the standard deviation in the first sample was $20,000 and the standard deviation in the second sample is $18,000, is the agent correct? Use = 0.05.