Refer to Exercise 1.19. The most recent NBI data were analyzed and the results published in the
Question:
Refer to Exercise 1.19. The most recent NBI data were analyzed and the results published in the Journal of Infrastructure Systems (June 1995). Using the FHWA inspection ratings, each of the 470,515 highway bridges in the United States was categorized as structurally deficient, functionally obsolete, or safe. About 26% of the bridges were found to be structurally deficient, while 19% were functionally obsolete.
a. What is the variable of interest to the researchers?
b. Is the variable of part a quantitative or qualitative?
c. Is the data set analyzed a population or a sample?
Explain.
d. How did the researchers obtain the data for their study?
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Related Book For 
Statistics For Business And Economics
ISBN: 9780130272935
8th Edition
Authors: James T. McClave, Terry Sincich, P. George Benson
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