Do people walk faster in the airport when they are departing (getting on a plane

Question

Do people walk faster in the airport when they are departing (getting on a plane) or 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 8S Click the icon to view the findings (a) Is this an observational study or a designed experiment? Why? A. This is an observational study since the researcher influenced the data B. This is an observational study since the researcher did not influence the data. C. This is a designed experiment since the researcher did not influence the data. D. This is a designed experiment since the researcher influenced the data (b) Explain why it is reasonable to use Welch's t-test A. The samples are random, large and dependent B. The samples are random, small and independent. C. The populations are normally distributed 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 alpha = 0.05 level of significance? Let mu_1 represent the mean speed of people departing and mu_2 represent the mean speed of people arriving mean speed of people arriving. State the null and alternative hypothesis. A. H_0: mu_1 mu_2 B. H_0: mu_1 = mu_2 H_1: mu_1 notequalto mu_2 C. H_0: mu_1 = mu_2 H_1: mu_1 mu_2 Determine the P-value for this hypothesis test. P-value = Choose the correct conclusion A. Reject H_0. There is sufficient evidence at the alpha = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing B. Do not reject H_0. There is not sufficient evidence at the alpha = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing C. Do not reject H_0. There is sufficient evidence at the alpha = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing. D. Reject H_0. There is not sufficient evidence at the alpha = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing.

Explanation / Answer

a) right option is B

This is an observational study  as the independent variable is not under the control of the researcher because of ethical concerns.

b) right option is D

c) This is a two tailed test .

Hence the right option is B

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