A study was done to compare the cost to rent an office in Washington, DC with the corresponding cost of similar office in New York City. A sample of 42 offices in Washington showed the mean rental rate to be $25,510, with a standard deviation of 37. A sample of 40 offices in NYC showed the mean rent to be $25,500, with a standard deviation of $32. At the 5% significance level, is there a difference in the mean rental rate between Washington, DC and New York city?