- X Walking Speed Direction of Travel Departure Arrival Mean speed 262 270 (feet per minute) Standard deviation 51 36 dep (feet per minute) Sample size 35 35 Print DoneDo 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. (a) Is this an observational study or a designed experiment? Why? O A. This is a designed experiment since the researcher influenced the data. O B. This is a designed experiment since the researcher did not influence the data. O C. This is an observational study since the researcher did not influence the data. O D. This is an observational study since the researcher influenced the data. (b) Explain why it is reasonable to use Welch's t-test. O A. The samples are random, large and dependent. O B. The samples are random, small and independent. O C. The populations are normally distributed. O D. The samples are random, large and independent. (c) Do individuals walk at different speeds depending on whether they are departing or arriving at the o = 0.1 level of significance? Let , represent the mean speed of people departing and 2 represent the mean speed of people arriving. State the null and alternative hypothesis. O A. HO: H1 = H2 OB. HO: M1 = H2 Hy: H1 =H2 H1: H1 > H2 O C. Ho: H1 = H2 OD. HO: H1

H2 Determine the P-value for this hypothesis test. P-value = (Round to three decimal places as needed.)Choose the correct conclusion. O A. Reject Ho. There is sufficient evidence at the o = 0.1 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing. O B. Reject Ho. There is not sufficient evidence at the