Davison Patel
06/05/2023 · Middle School
Use the data and your calculator to generate a modified boxplot. Identify the correct graph. \[ \begin{array}{llllllll}11 & 15 & 13 & 2 & 9 & 8 & 10 & 12\end{array} \]
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Step-by-step Solution
To create a modified boxplot, we first need to calculate the five-number summary (minimum, first quartile \(Q_1\), median \(Q_2\), third quartile \(Q_3\), and maximum) and identify any outliers.
### Step 1: Sort the Data
First, we sort the data in ascending order:
\[ 2, 8, 9, 10, 11, 12, 13, 15 \]
### Step 2: Calculate the Five-Number Summary
- **Minimum**: The smallest value is \(2\).
- **Maximum**: The largest value is \(15\).
- **Median (Q2)**: The median is the average of the two middle numbers (10 and 11):
\[
Q_2 = \frac{10 + 11}{2} = 10.5
\]
- **First Quartile (Q1)**: The first quartile is the median of the first half of the data (2, 8, 9, 10):
\[
Q_1 = \frac{8 + 9}{2} = 8.5
\]
- **Third Quartile (Q3)**: The third quartile is the median of the second half of the data (11, 12, 13, 15):
\[
Q_3 = \frac{12 + 13}{2} = 12.5
\]
### Step 3: Calculate the Interquartile Range (IQR)
The interquartile range is calculated as:
\[
IQR = Q_3 - Q_1 = 12.5 - 8.5 = 4
\]
### Step 4: Determine Outliers
Outliers are defined as any data points that fall below \(Q_1 - 1.5 \times IQR\) or above \(Q_3 + 1.5 \times IQR\).
- Lower bound:
\[
Q_1 - 1.5 \times IQR = 8.5 - 1.5 \times 4 = 8.5 - 6 = 2.5
\]
- Upper bound:
\[
Q_3 + 1.5 \times IQR = 12.5 + 1.5 \times 4 = 12.5 + 6 = 18.5
\]
### Step 5: Identify Outliers
In this dataset, the only potential outlier is below the lower bound:
- Values below \(2.5\): None
- Values above \(18.5\): None
Thus, there are no outliers in this dataset.
### Step 6: Create the Boxplot
Now we can create the modified boxplot using the five-number summary:
- Minimum: \(2\)
- \(Q_1\): \(8.5\)
- Median: \(10.5\)
- \(Q_3\): \(12.5\)
- Maximum: \(15\)
### Boxplot Representation
The boxplot will have:
- A box from \(Q_1\) (8.5) to \(Q_3\) (12.5)
- A line at the median (10.5)
- Whiskers extending from the minimum (2) to the maximum (15)
### Conclusion
You can now draw the boxplot based on the calculated values. If you have options for the boxplot, look for one that matches the description above.
Quick Answer
The boxplot should have a box from 8.5 to 12.5, a line at 10.5, and whiskers from 2 to 15.
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