2. A company is trying to decide which of the two types of tires to buy for their trucks. They would like to adopt brand C unless there is some evidence that brand D is better. An experiment was conducted where 16 tires from each brand were used. The tires were run under similar conditions until they wore out. The results are: Brand C: X_1= 40,000 kms S_1 = 5,400 kms Brand D : X_2= 38,000 kms S_2= 3,200 kms What conclusion can be drawn?