Homework Chapter 2
Question 17 (2 points) Attempt 2 of Unlimited

The geyser Old Faithful in Yellowstone National Park alternates periods of eruption, which typically last from 1.5 to 4 minutes, with periods of dormancy that are considerably longer. The following table presents the durations, in minutes, of 30 dormancy periods that occurred during a recent year.

\begin{tabular}{lllllllll}
\hline
93 & 71 & 92 & 90 & 96 & 91 & 66 & 97 & 91 \\
93 & 82 & 99 & 116 & 83 & 59 & 61 & 66 & 59 \\
99 & 93 & 96 & 90 & 88 & 82 & 82 & 93 & 61 \\
105 & 91 & 91 & & & & & & \\
\hline
\end{tabular}

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Part: [tex]$0 / 2$[/tex]

Part 1 of 2

(a) Construct a frequency distribution using a class width of 5, and using 55 as the lower class limit for the first class.

\begin{tabular}{lc}
\hline
[tex]$55-59$[/tex] & [tex]$3$[/tex] \\
[tex]$60-64$[/tex] & [tex]$3$[/tex] \\
[tex]$65-69$[/tex] & [tex]$2$[/tex] \\
[tex]$70-74$[/tex] & [tex]$1$[/tex] \\
[tex]$75-79$[/tex] & [tex]$0$[/tex] \\
[tex]$80-84$[/tex] & [tex]$3$[/tex] \\
[tex]$85-89$[/tex] & [tex]$1$[/tex] \\
[tex]$90-94$[/tex] & [tex]$11$[/tex] \\
[tex]$95-99$[/tex] & [tex]$5$[/tex] \\
[tex]$100-104$[/tex] & [tex]$0$[/tex] \\
[tex]$105-109$[/tex] & [tex]$1$[/tex] \\
[tex]$110-114$[/tex] & [tex]$0$[/tex] \\
[tex]$115-119$[/tex] & [tex]$1$[/tex] \\
\hline
\end{tabular}

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Answer :

Sure, let's go through the steps to construct a frequency distribution for the dormancy periods.

1. Understand the data and the specifications:
- We have a dataset of dormancy periods given as: 93, 71, 92, 90, 96, 91, 66, 97, 91, 93, 82, 99, 116, 83, 59, 61, 66, 59, 99, 93, 96, 90, 88, 82, 82, 93, 61, 105, 91, 91.
- We need to construct a frequency distribution table with a class width of 5, starting with the lower class limit of 55.

2. Determine the range of classes:
- The minimum value in the dataset is 59, and the maximum value is 116.
- The classes will begin from 55 and increase in increments of 5.

3. Calculate the number of classes:
- Using the classes defined by our specified width and limits, we calculate the classes as follows:
1. 55-59
2. 60-64
3. 65-69
4. 70-74
5. 75-79
6. 80-84
7. 85-89
8. 90-94
9. 95-99
10. 100-104
11. 105-109
12. 110-114
13. 115-119

4. Construct the frequency distribution:
- Now, we count the number of data points falling into each of the class intervals. Here's the breakdown:
- 55-59: 2 occurrences (59, 59)
- 60-64: 2 occurrences (61, 61)
- 65-69: 2 occurrences (66, 66)
- 70-74: 1 occurrence (71)
- 75-79: 0 occurrences
- 80-84: 4 occurrences (82, 83, 82, 82)
- 85-89: 1 occurrence (88)
- 90-94: 11 occurrences (93, 92, 90, 91, 91, 93, 93, 93, 90, 91, 91)
- 95-99: 5 occurrences (96, 97, 99, 96, 99)
- 100-104: 0 occurrences
- 105-109: 1 occurrence (105)
- 110-114: 0 occurrences
- 115-119: 1 occurrence (116)

Here is the resulting frequency distribution table:

[tex]\[ \begin{array}{|c|c|} \hline \text{Dormancy Period (min)} & \text{Frequency} \\ \hline 55-59 & 2 \\ \hline 60-64 & 2 \\ \hline 65-69 & 2 \\ \hline 70-74 & 1 \\ \hline 75-79 & 0 \\ \hline 80-84 & 4 \\ \hline 85-89 & 1 \\ \hline 90-94 & 11 \\ \hline 95-99 & 5 \\ \hline 100-104 & 0 \\ \hline 105-109 & 1 \\ \hline 110-114 & 0 \\ \hline 115-119 & 1 \\ \hline \end{array} \][/tex]

This table summarizes the frequency of dormancy periods falling within each specified interval.