(a) Is this an observational study or a designed experiment? Why? O A. This is an observational study since the researcher influenced the data. O B. This is an observational study since the researcher did not influence the data. OC. This is a designed experiment since the researcher did not influence the data. O D. This is a designed experiment 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. OC. 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 a = 0.05 level of significance? Let u, represent the mean speed of people departing and u, represent mean speed of people arriving. State the null and alternative hypothesis. O A. Ho: H1 P2 OC. Ho: H1 = H2 O D. Ho: H1 = H2 H,: H > 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 a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing. O B. Do not reject H. There is not sufficient evidence at the a = 0.05 level of significance to say that travelers walk different speeds depending on whether they are arriving or departing. OC. Do not reject H,. There is sufficient evidence at the a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing. O D. Reject H. There is not sufficient evidence at the a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing.
(a) Is this an observational study or a designed experiment? Why? O A. This is an observational study since the researcher influenced the data. O B. This is an observational study since the researcher did not influence the data. OC. This is a designed experiment since the researcher did not influence the data. O D. This is a designed experiment 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. OC. 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 a = 0.05 level of significance? Let u, represent the mean speed of people departing and u, represent mean speed of people arriving. State the null and alternative hypothesis. O A. Ho: H1 P2 OC. Ho: H1 = H2 O D. Ho: H1 = H2 H,: H > 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 a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing. O B. Do not reject H. There is not sufficient evidence at the a = 0.05 level of significance to say that travelers walk different speeds depending on whether they are arriving or departing. OC. Do not reject H,. There is sufficient evidence at the a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing. O D. Reject H. There is not sufficient evidence at the a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:(a) Is this an observational study or a designed experiment? Why?
O A. This is an observational study since the researcher influenced the data.
O B. This is an observational study since the researcher did not influence the data.
O C. This is a designed experiment since the researcher did not influence the data.
O D. This is a designed experiment 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.
OC. 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 a = 0.05 level of significance? Let p, represent the mean speed of people departing and u, represent the
mean speed of people arriving.
State the null and alternative hypothesis.
O A. Ho: H1 <H2
O B. H9: H1 = H2
H: H1> H2
OC. Ho: H1 = H2
O D. 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 H,- There is sufficient evidence at the a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing.
O B. Do not reject H,. There is not sufficient evidence at the a= 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing.
OC. Do not reject Ho. There is sufficient evidence at the a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing.
O D. Reject Ho- There is not sufficient evidence at the a = 0.05 level of significance to say that travelers walk at different speeds depending on whether they are arriving or departing.
Transcribed Image 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.
E Click the icon to view the findings.
- X
Walking Speed
Direction of Travel
Departure
Arrival
data,
Mean speed
(feet per minute)
Standard deviation
(feet per minute)
Sample size
263
270
49
32
data,
35
35
Print
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