4-5 An engineer wishing to determine whether there is a statistically significant difference between the average speed of passenger cars and that of large trucks on a section of highway, collected the data shown below. Determine whether the engineer can con- clude that the average speed of large trucks is the same as that for passenger cars. Average Speed (mi/h) Standard deviation of speed ± mi/h Sample size Trucks 62 5.5 275 Passenger Cars 59 6.3 175

4-5 An engineer wishing to determine whether there is a statistically significant difference between the average speed of passenger cars and that of large trucks on a section of highway, collected the data shown below. Determine whether the engineer can con- clude that the average speed of large trucks is the same as that for passenger cars. Average Speed (mi/h) Standard deviation of speed ± mi/h Sample size Trucks 62 5.5 275 Passenger Cars 59 6.3 175

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

4-5
An engineer wishing to determine whether there is a statistically significant difference
between the average speed of passenger cars and that of large trucks on a section of
highway, collected the data shown below. Determine whether the engineer can con-
clude that the average speed of large trucks is the same as that for passenger cars.
Average Speed (mi/h)
Standard deviation of speed ± mi/h
Sample size
Trucks
62
5.5
275
Passenger Cars
59
6.3
175

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