An engineer, wishing to determine the travel time and average speed along a section of an urban highway as part of an annual trend analysis on traffic operations, conducted a travel time study using the floating-car technique. He carried out 10 runs and obtained a standard deviation of ±3.4 mi/h in the speeds obtained. If a 5% significance level is assumed, is the number of test runs adequate?
What will be an ideal response?
Use Equation 4.11:
For trend analysis, assume ±3 mi/h acceptable error.
N = [1.833(3.4)/3]2
N = 4.32 runs
Therefore, 10 runs is adequate
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