City officials in Dallas conducted a survey to study commute times. The commute times (in minutes) of a random sample of Dallas residents is shown below. Click on the data button below to open the data in a new window. Data a. Construct a 97% confidence interval for the mean commute time of Dallas residents. Critical value: z x or t x = (Enter the positive one.) Margin of Error: E = Confidence Interval: [ b. Interpret your result in part (a) in a complete sentence