Researchers studied the effect of road-junction design on travel efficiency. They created two four-way inter- sections (i.e., a crossroads). One intersection was a typical four-way stop: cars had to stop and wait for the way to be clear before they could drive through the intersection. The other intersection used a roundabout: cars only had to stop if another car was already in the roundabout. They timed how long it took for cars to pass though the intersection in moderately heavy traffic conditions. A sample of 8 cars were monitored at the four-way-stop intersection. Here are their times (in seconds): 20, 17, 19, 15, 23, 20, 19, 21. A sample of 10 cars were monitored at the roundabout intersection. Here are their times (in seconds): 16, 16, 22, 14, 21, 15, 15, 15, 11, 14. Calculate the mean time (and standard deviation) taken by the cars in each intersection and analyze the data to determine if the means are significantly different. Calculate the effect size, Cohen's d. Report your findings as a sentence or two that could be in the Results section of an APA-style research article.
Researchers studied the effect of road-junction design on travel efficiency. They created two four-way inter- sections (i.e., a crossroads). One intersection was a typical four-way stop: cars had to stop and wait for the way to be clear before they could drive through the intersection. The other intersection used a roundabout: cars only had to stop if another car was already in the roundabout. They timed how long it took for cars to pass though the intersection in moderately heavy traffic conditions. A sample of 8 cars were monitored at the four-way-stop intersection. Here are their times (in seconds): 20, 17, 19, 15, 23, 20, 19, 21. A sample of 10 cars were monitored at the roundabout intersection. Here are their times (in seconds): 16, 16, 22, 14, 21, 15, 15, 15, 11, 14. Calculate the mean time (and standard deviation) taken by the cars in each intersection and analyze the data to determine if the means are significantly different. Calculate the effect size, Cohen's d. Report your findings as a sentence or two that could be in the Results section of an APA-style research article.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter6: Systems Of Linear Equations And Inequalities
Section6.1: Graphing Systems Of Equations
Problem 59PFA
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Transcribed Image Text:Researchers studied the effect of road-junction design on travel efficiency. They created two four-way inter-
sections (i.e., a crossroads). One intersection was a typical four-way stop: cars had to stop and wait for the
way to be clear before they could drive through the intersection. The other intersection used a roundabout:
cars only had to stop if another car was already in the roundabout. They timed how long it took for cars to
pass though the intersection in moderately heavy traffic conditions.
A sample of 8 cars were monitored at the four-way-stop intersection. Here are their times (in seconds):
20, 17, 19, 15, 23, 20, 19, 21.
A sample of 10 cars were monitored at the roundabout intersection. Here are their times (in seconds):
16, 16, 22, 14, 21, 15, 15, 15, 11, 14.
Calculate the mean time (and standard deviation) taken by the cars in each intersection and analyze the data
to determine if the means are significantly different. Calculate the effect size, Cohen's d. Report your findings
as a sentence or two that could be in the Results section of an APA-style research article.
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VIEWStep 4: Perform hypothesis test to check if two means are significantly different.
VIEWStep 5: Compute the effect size for the hypothesis test.
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