Do people walk faster in the airport when they are departing (getting on a plane) or do they walk faster when they are arriving (getting off a plane)? A reputable researcher measured the walking speed...

Extracted text: Do people walk faster in the airport when they are departing (getting on a plane) or do they walk faster when they are arriving (getting off a plane)? A reputable researcher measured the walking speed of random travelers in two International Airports. His findings are summarized in the table. Complete parts (a)-(c) below. EER Click the icon to view the findings. (a) Is this an observational study or a designed experiment? Why? O A. This is an observational study since the researcher influenced the data X Walking Speed O B. This is a designed experiment since the researcher influenced the data. O C. This is a designed experiment since the researcher did not influence the data. O D. This is an observational study since the researcher did not influence the data Direction of Travel Mean speed (feet per minute) Standard deviation (feet per minute) Sample size Departure Arrival 251 274 (b) Explain why it is reasonable to use Welch's t-test 45 38 O A. The populations are normally distributed. 35 35 O B. The samples are random, large and independent O C. The samples are random, small and independent. Print Done O D. The samples are random, large and dependent. Click to select vour answer(s)