Concept explainers
a.
To construct: The histogram using the provided data of travel time.
a.
Explanation of Solution
Given:
The data set is:
17.6 | 23.6 |
17.7 | 17.7 |
24.2 | 25 |
24.6 | 20.7 |
29.1 | 26.8 |
20.9 | 23.9 |
30.9 | 24.1 |
23.4 | 23.6 |
15.5 | 25.9 |
22.1 | 27.3 |
20 | 25.5 |
21.8 | 20.1 |
25 | 27.9 |
22.3 | 22.3 |
22.9 | 18.2 |
15.9 | 18.5 |
23.5 | 22.4 |
24.6 | 25.1 |
20.8 | 22.3 |
21.2 | 30.6 |
26.9 | 26.6 |
25.2 | 23.4 |
25.6 | 22 |
20.8 | 24 |
17.9 | 22.9 |
29.2 |
Calculation:
To construct the histogram, frequency distribution is required and it could be constructed as:
Graph:
The histogram could be constructed as:
b.
To describe: The shape of the provided distribution. Also, find the common interval of travel times.
b.
Explanation of Solution
From the above histogram, it can be concluded that the distribution of DRP scores is approximately normal that tells that the sample population data is also normally distributed.
It could be seen from the frequency distribution constructed in above part; the frequency is the highest for the interval 22-24. Thus, it could be said that 22-24 is the common interval of travel times.
Chapter 1 Solutions
PRACTICE OF STATISTICS F/AP EXAM
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