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. Click the icon to view the findings. (a) Is this an observational study or a designed experiment? Why? O A. This is a designed experiment since the researcher did not influence the data. O B. This is an observational study since the researcher influenced the data. O C. This is a designed experiment since the researcher influenced the data. C D. This is an observational study since the researcher did not influence 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. C. The samples are random, large and independent. O D. The populations are normally distributed. (c) Do individuals walk at different speeds depending on whether they are departing or arriving at the a 0.05 level of significance? Let p, represent the mean speed of people departing and u2 represent the mean speed of people arriving. State the null and alternative hypothesis. OB. Hg PsH2 O A. Ho H1 H2 OC. Ho H1 =H2 H H > H2 OD. H H H2 H PP2

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.