A steel supplier claims that their bars have elongation of 40 percent under a stress of 10 metric tons. A random sample of 12 steel bars was taken from a warehouse and the elongation measured per 2 inches determined. Observed values of 39, 41, 35, 33, 35, 39, 33, 37, 36, 40, 41, 42 were obtained. Construct a 90% confidence interval for the elongation of the steel bars. Does this interval support the claim that the bars have an elongation of 40 percent? Justify your response