Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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Question
Consider the following spot speed data, which were collected from the location of expressways operating under free flow conditions: a. Draw the frequency curve and cumulative frequency for this data. b. Find and identify on the curve: average speed, modud speed, pace, percent of vehicles in pace. c. Calculate the mean and standard deviation of the velocity distribution. d. What are the confidence bounds in the true mean velocity estimate of the underlying distribution with a 95% confidence level? With a 99.7% confidence level? e. Based on the results of this study, a second study should be conducted to achieve a tolerance of ±1.5 mi/hour with a 95% confidence level. What is the required sample size? f. Can this data deserve to be declared as normal?
Speed Group (miles/ho ur) 15-20 Number of Vehicles Observed N 20-25 3 25-30 30-35 35-40 18 45 40-45 48 45-50 18 50-55 12 55-60 4 60-65 3 65-70
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Transcribed Image Text:Speed Group (miles/ho ur) 15-20 Number of Vehicles Observed N 20-25 3 25-30 30-35 35-40 18 45 40-45 48 45-50 18 50-55 12 55-60 4 60-65 3 65-70
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Step 1 Interpretation of data
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Step 2 Primary Calculations
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Step 3 Draw the frequency curve and cumulative frequency
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Step 4 (B)
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Step 5 Standard Deviation of the speed
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