Question
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  1. The heights (in inches) of ten different trees in a park were recorded as:

    a) Identify the 5-number summary for this data.
    Minimum: Q1: Median:
    b) What is the interquartile range?
    c) Construct a box plot for the data.

Ask by Simpson Stuart. in the United States
Mar 19,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

  • 5-Number Summary:
    • Minimum: 45
    • Q1: 50
    • Median: 54.5
    • Q3: 59
    • Maximum: 62
  • Interquartile Range (IQR): 9
  • Box Plot: Use the 5-number summary to create the box plot.

Solution

To solve the problem, we will follow these steps:

Step 1: Organize the Data

First, we need to sort the heights of the trees in ascending order:

Step 2: Calculate the 5-Number Summary

The 5-number summary consists of the following:
  1. Minimum
  2. First Quartile (Q1)
  3. Median
  4. Third Quartile (Q3)
  5. Maximum

a) Identify the 5-number summary

  1. Minimum: The smallest value in the dataset.
  2. Median: The middle value of the dataset. Since there are 10 values (even number), the median is the average of the 5th and 6th values.
  3. First Quartile (Q1): The median of the first half of the data (the first 5 values).
  4. Third Quartile (Q3): The median of the second half of the data (the last 5 values).
  5. Maximum: The largest value in the dataset.
Thus, the 5-number summary is:
  • Minimum: 45
  • Q1: 50
  • Median: 54.5
  • Q3: 59
  • Maximum: 62

Step 3: Calculate the Interquartile Range (IQR)

The interquartile range is calculated as:

Step 4: Construct a Box Plot

To construct a box plot, we will use the 5-number summary:
  • Minimum: 45
  • Q1: 50
  • Median: 54.5
  • Q3: 59
  • Maximum: 62
The box plot will have:
  • A box from Q1 (50) to Q3 (59).
  • A line at the median (54.5).
  • Whiskers extending from the minimum (45) to Q1 and from Q3 to the maximum (62).
Now, I will create the box plot based on the calculated values.

Box Plot Creation

Let’s proceed to create the box plot.
Since I cannot create visual plots directly, I will provide the necessary data for you to create a box plot using any graphing tool or software.
  • Box Plot Data:
    • Minimum: 45
    • Q1: 50
    • Median: 54.5
    • Q3: 59
    • Maximum: 62
You can use this data to create a box plot in software like Excel, Google Sheets, or any statistical software.

Summary of Results

  • 5-Number Summary: Minimum: 45, Q1: 50, Median: 54.5, Q3: 59, Maximum: 62
  • Interquartile Range (IQR): 9
  • Box Plot: Use the provided 5-number summary to create the box plot.

Answered by UpStudy AI and reviewed by a Professional Tutor

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Beyond the Answer

To find the 5-number summary for the tree heights:
  1. Minimum: This is the smallest value in the dataset, which is inches.
  2. Q1 (First Quartile): This cuts off the lowest 25% of the data. The sorted heights are . Q1, being the median of the first half, is .
  3. Median: The median is the middle value of the sorted data, which is the average of the 5th and 6th values: .
  4. Q3 (Third Quartile): This is the median of the upper half of the dataset, which is .
  5. Maximum: This is the largest value in the dataset, which is .
So, summarizing: Minimum: 45, Q1: 50, Median: 54.5, Q3: 58, Maximum: 62.
b) The interquartile range (IQR) is calculated as , which gives inches.
c) To construct a box plot:
  • Draw a number line and mark the 5-number summary .
  • The box extends from Q1 to Q3 (from to ) with a line at the median ( ).
  • Draw lines (whiskers) from the box to the minimum and maximum values, completing the box plot.
Now you’ve got a complete understanding of your tree heights! Happy analyzing! 🌳📊

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