Do people walk faster in the airport when they are departing (getting on a plane) or when they are arriving (getting off a plane)? Researcher Seth B. Young measured the walking speed of travelers in San Francisco International Airport and Cleveland Hopkins International Airport. His findings are summarized in the table.

(a) Is this an observational study or a designed experiment? Why?
(b) Explain why it is reasonable to use Welch€™s t-test.
(c) Do individuals walk at different speeds depending on whether they are departing or arriving at the α = 0.05 level of significance?

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Departure Arrival Direction of Travels Mean speed (feet per minute) Standard deviation (feet per minute) Sample size 260 53 35 269 34 35