It is thought that a new process for producing a certain chemical may be cheaper than the currently used process. Each process was run 6 times, and the cost of producing 100-L of the chemical was determined each time. The results, listed in dollars, were as follows: New Process 51 52 55 53 54 53 Old Process 50 54 59 56 59 58 Can you conclude that the mean cost of the new method is less than that of the old method?