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.

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.

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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Mapping

Mapping is the process of representing the surface of the earth, objects on it, and the relative positions of the objects, to a suitable scale. In mapping, a large area of land is measured, surveyed, and plotted. The details of the objects present in the nearby surrounding area are located using conventional signs. All these processes are carried out on a flat paper known as a map.

Question

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.

1
2
3
4
n
Time
# Of
Speed
Cumulative
(Sec)
Observations
(MPH)
Percent
1
2.0
1
30
100.00%
23456789
2.2
2.4
2.6
224
2
27.27
99.23%
2
25
97.69%
23.08
96.15%
2.8
7
21.43
93.08%
3.0
15
20
87.69%
3.2
22
18.75
76.15%
3.4
16
17.65
59.23%
9
3.6
12
16.67
46.92%
10
3.8
11
15.79
37.69%
11
4.0
9
15
29.23%
12
4.2
7
14.29
22.31%
13
14
34
4.4
5
13.63
16.92%
4.6
6
13.04
13.08%
15
4.8
3
12.5
8.46%
16
17
67
5.0
0
12
6.15%
5.2
2
11.54
6.15%
18
5.4
3
11.11
4.62%
19
5.6
1
10.71
2.31%
20
5.8
0
10.34
1.54%
21
6.0
1
10
1.54%
22
6.2
1
9.68
0.77%
Σ= 130
Z=359.48

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