**Traffic Sign Maintenance** The Federal Highway Administration (FHWA) recently issued new guidelines for maintaining and replacing traffic signs. Civil engineers at North Carolina State University studied the effectiveness of various sign maintenance practices aligned with these guidelines and published their findings in the Journal of Transportation Engineering (June 2013). The study included a focus on the proportion of traffic signs failing to meet the minimum FHWA retroreflectivity requirements. Of 1,000 signs maintained by the North Carolina Department of Transportation (NCDOT), 512 were deemed failures. In contrast, of 1,000 signs maintained by county-owned roads in North Carolina, 328 were deemed failures. To assess whether the true proportions of traffic signs failing the FHWA retroreflectivity requirements differ based on maintenance by NCDOT or county entities, a hypothesis test is conducted. The significance level is set at α = 0.05, with a test statistic of z = 8.34. Consider the information in the exercise and address the following question: Do the data provide significant evidence at the 2% level that the population proportion of signs maintained by county-owned roads failing the FHWA requirements is less than the corresponding population proportion of signs maintained by NCDOT?
**Traffic Sign Maintenance** The Federal Highway Administration (FHWA) recently issued new guidelines for maintaining and replacing traffic signs. Civil engineers at North Carolina State University studied the effectiveness of various sign maintenance practices aligned with these guidelines and published their findings in the Journal of Transportation Engineering (June 2013). The study included a focus on the proportion of traffic signs failing to meet the minimum FHWA retroreflectivity requirements. Of 1,000 signs maintained by the North Carolina Department of Transportation (NCDOT), 512 were deemed failures. In contrast, of 1,000 signs maintained by county-owned roads in North Carolina, 328 were deemed failures. To assess whether the true proportions of traffic signs failing the FHWA retroreflectivity requirements differ based on maintenance by NCDOT or county entities, a hypothesis test is conducted. The significance level is set at α = 0.05, with a test statistic of z = 8.34. Consider the information in the exercise and address the following question: Do the data provide significant evidence at the 2% level that the population proportion of signs maintained by county-owned roads failing the FHWA requirements is less than the corresponding population proportion of signs maintained by NCDOT?
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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Transcribed Image Text:**Traffic Sign Maintenance**
The Federal Highway Administration (FHWA) recently issued new guidelines for maintaining and replacing traffic signs. Civil engineers at North Carolina State University studied the effectiveness of various sign maintenance practices aligned with these guidelines and published their findings in the Journal of Transportation Engineering (June 2013).
The study included a focus on the proportion of traffic signs failing to meet the minimum FHWA retroreflectivity requirements. Of 1,000 signs maintained by the North Carolina Department of Transportation (NCDOT), 512 were deemed failures. In contrast, of 1,000 signs maintained by county-owned roads in North Carolina, 328 were deemed failures.
To assess whether the true proportions of traffic signs failing the FHWA retroreflectivity requirements differ based on maintenance by NCDOT or county entities, a hypothesis test is conducted. The significance level is set at α = 0.05, with a test statistic of z = 8.34.
Consider the information in the exercise and address the following question: Do the data provide significant evidence at the 2% level that the population proportion of signs maintained by county-owned roads failing the FHWA requirements is less than the corresponding population proportion of signs maintained by NCDOT?
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