Thousands of motorists travel on Highway 27 everyday. Before installation of traffic cameras at mile marker 11, motorists' speeds averaged 72 mph. After installation of cameras, speeds averaged 67 mph. A paired samples t-test comparing the average speeds yielded a t-statistic of 1.02. Remember, the critical value at p=.05 is 1.96. Assuming our data meet the requirements for conducting a t-test, what can we conclude? There is less than a 5% chance that we would have observed this average difference if there really wasn't a difference in average speeds before and after the camera was installed. We cannot draw any conclusions because we should have used an independent samples t-test. We cannot draw any conclusions because we should have used a one-sample t-test. We cannot draw any conclusions becaue the p-value is not reported. We cannot draw any conclusions because the standard deviation was not reported. We do not have enough information to draw any conclusions.
Thousands of motorists travel on Highway 27 everyday. Before installation of traffic cameras at mile marker 11, motorists' speeds averaged 72 mph. After installation of cameras, speeds averaged 67 mph. A paired samples t-test comparing the average speeds yielded a t-statistic of 1.02. Remember, the critical value at p=.05 is 1.96. Assuming our data meet the requirements for conducting a t-test, what can we conclude? There is less than a 5% chance that we would have observed this average difference if there really wasn't a difference in average speeds before and after the camera was installed. We cannot draw any conclusions because we should have used an independent samples t-test. We cannot draw any conclusions because we should have used a one-sample t-test. We cannot draw any conclusions becaue the p-value is not reported. We cannot draw any conclusions because the standard deviation was not reported. We do not have enough information to draw any conclusions.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Thousands of motorists travel on Highway 27 everyday. Before installation of traffic cameras at mile marker 11, motorists' speeds averaged 72 mph. After installation of cameras, speeds averaged 67 mph. A paired samples t-test comparing the average speeds yielded a t-statistic of 1.02. Remember, the critical value at p=.05 is 1.96. Assuming our data meet the requirements for conducting a t-test, what can we conclude?
- There is less than a 5% chance that we would have observed this average difference if there really wasn't a difference in average speeds before and after the camera was installed.
- We cannot draw any conclusions because we should have used an independent samples t-test.
- We cannot draw any conclusions because we should have used a one-sample t-test.
- We cannot draw any conclusions becaue the p-value is not reported.
- We cannot draw any conclusions because the standard deviation was not reported.
- We do not have enough information to draw any conclusions.
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