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Chapter 2: Q129E (page 131)

Question: Hourly road accidents in India.An analysis of road accident data in India was undertaken, and the results were published in the Journal of Big Data(Vol. 2, 2015). For a particular cluster of roads, the hourly numbers of accidents totaled over a recent 5-year period are listed in the next table. (These results are adapted from a figure in the journal article.) Create a scatterplot of the data, with a number of accidents on the vertical axis and hours on the horizontal axis. What type of trend (if any) do you detect in the data?

Hour

Number

1

2

3

4

5

6

7

8

9

10

11

12

125

148

159

270

281

295

302

216

225

353

400

327

Short Answer

Expert verified

Answer:

The graph is given below:

There is a positive trend.

Step by step solution

01

Creating the scatter plot

We will plot the number of accidents on the y-axis and the hour on the x-axis.

The graph is given below:

02

Identifying the trend

We notice that as hours increase, the number of accidents also increases.Therefore, there is a positive correlation between the number of accidents and hours.

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Most popular questions from this chapter

Jamming attacks on wireless networks. Refer to the International Journal of Production Economics (Vol. 172, 2016) study of U.S. military jamming attacks on wireless networks used by terrorists, Exercise 1.16 (p. 50). Recall that 80 recent jamming attacks were classified according to network type (WLAN, WSN, or AHN) attacked and number of channels (single- or multi-channel) of the network. The results are summarized in the accompanying table.

Network Type/
Number of Channels

Number of
Jamming Attacks

WLAN / Single

31

WSN / Single

13

AHN / Single

8

WLAN / Multi

14

WSN / Multi

9

AHN / Multi

5

Total

80

a. Construct a Pareto diagram for the data. Interpret the results.

b. Construct a pie chart for network type only. Interpret the results.

Parking at a university has become a problem. The university鈥檚 administrators are interested in determining the average time it takes a student to find a parking spot. An administrator inconspicuously followed 190 students and recorded how long it took each of them to find a parking spot. The durations had a distribution that was skewed to the left. Based on this information, discuss the relationship between the mean and the median for the 190 times collected.

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Ecolabel

Mean

Std. Dev.

Energy Star

4.44

0.82

TripAdvisor

3.57

1.38

Green Leaders Audubon

2.41

1.44

International U.S Green

2.28

1.39

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2.25

1.39

Green Key

2.01

1.30

Question: Performance of stock screeners.Refer to the American Association of Individual Investors (AAII) statistics on stock screeners, Exercise 2.44 (p. 95). Annualized percentage return on investment (as compared to the Standard & Poor鈥檚 500 Index) for 13 randomly selected stock screeners are reproduced in the table.

(9.0, -.1, -1.6, 14.6, 16.0, 7.7, 19.9, 9.8, 3.2, 24.8, 17.6, 10.7, 9.1)

a.Find the range of the data for the 13 stock screeners. Give the units of measurement for the range.

b.Find the variance of the data for the 13 stock screeners. If possible, give the units of measurement for the variance.

c.Find the standard deviation of the data for the 13 stock screeners. Give the units of measurement for the standard deviation

If the range of a set of data is 20, find a rough approximation to the standard deviation of the data set.
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