In a study of annual salaries of employees, random samples were selected from two companies to see if there is a difference in their average annual salaries. For Company “A” the sample size was 72, the sample mean was $48,000 and the Population standard deviation is assumed to be $12,000. For Company “B” the sample size was 50, the sample mean was $43,000 and the Population standard deviation was assumed to be $10,000. At a 5% level of significance, what is your conclusion?