1.) Spot Speed Study A student studying the spot speed of a rural road was able to measure spot speeds for 50 vehicles. If the standard deviation of the speed readings was ± 5.0 km/h and the limit of acceptable error was ± 1.5 mi/h. At 95% confidence level (Z = 1.96), a) Determine the required number of samples. b) Determine whether the student was able to satisfy the requirement for sample size.

1.) Spot Speed Study A student studying the spot speed of a rural road was able to measure spot speeds for 50 vehicles. If the standard deviation of the speed readings was ± 5.0 km/h and the limit of acceptable error was ± 1.5 mi/h. At 95% confidence level (Z = 1.96), a) Determine the required number of samples. b) Determine whether the student was able to satisfy the requirement for sample size.

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

1.) Spot Speed Study

A student studying the spot speed of a rural road was able to measure spot speeds for 50 vehicles. If the standard deviation of the speed readings was ± 5.0 km/h and the limit of acceptable error was ± 1.5 mi/h. At 95% confidence level (Z = 1.96),

a) Determine the required number of samples.

b) Determine whether the student was able to satisfy the requirement for sample size.

1.) Spot Speed Study
A student studying the spot speed of a rural road was able to measure spot speeds for
50 vehicles. If the standard deviation of the speed readings was + 5.0 km/h and the limit
of acceptable error was + 1.5 mi/h. At 95% confidence level (Z = 1.96),
a) Determine the required number of samples.
b) Determine whether the student was able to satisfy the requirement for sample size.

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4. The statistical data of an urban spot speed study is given below. A set of 130 observations of spot speeds made by timing vehicles through a "Trap" of 88ft. The stopwatch was used to obtain data. The stopwatch data are grouped into 0.2 sec. Classes. The first column of the table shows the midpoint of each group. The second column of the table shows the frequency of the observations. Compute the following statistical values. a) The speed of each time class in mph (show it in the third column) b) The cumulative percent of vehicles traveling at or below indicated speed shown in the third column in mph (show it in the forth column) c) Mean or average speed (time-mean speed), median, mode, standard deviation, standard error of the mean, average time, space-mean speed, variance, 15%, and 85% speed. d) Plot the cumulative percentage, and show the statistical values of item (c) on the graph. e) Plot the frequency distribution curve and show the statistical values on the graph.