Do people walk faster in the airport when they are departing or when they are arriving? Researchers measured the walking speed of 52 departing travelers and 75 arriving travelers at Sacramento International Airport. They found that departing travelers had a mean walking speed of 268 ft/min, and arriving travelers had a mean walking speed of 254 ft/min. The standard deviation was 30 ft/min for departing travelers and 57 ft/min for arriving travelers. a. Construct a 87% confidence interval for the difference in mean walking speed between departing and arriving travelers. Critical value: z or t = (Enter the positive one.) Margin of Error: E = Confidence Interval: b. Interpret your result in part (a) in a complete sentence. c. Based on your confidence interval, can you conclude that departing travelers walk at a different speed than arriving travlers? Yes No Submit Question