Math Problem Statement

Using box-and-whisker plots to compare noon temperatures of two cities.

Solution

Let's analyze the box-and-whisker plot to answer the given questions based on the image.

  1. (a) Which city had noon temperatures with a larger interquartile range (IQR)?

    • The interquartile range (IQR) is the distance between the first quartile (Q1) and the third quartile (Q3).
    • From the plot:
      • City A: The IQR is the distance between approximately 65°F (Q1) and 75°F (Q3), which gives an IQR of about 10°F.
      • City B: The IQR is the distance between approximately 60°F (Q1) and 85°F (Q3), giving an IQR of about 25°F.
      • Answer: City B had a larger IQR.
  2. (b) Which city had a larger median noon temperature?

    • The median is represented by the line inside the box.
    • City A: The median appears to be about 70°F.
    • City B: The median appears to be around 75°F.
    • Answer: City B had a larger median temperature.
  3. (c) Which city had the highest noon temperature?

    • The highest temperature is indicated by the end of the whisker on the right.
    • City A: The maximum temperature is around 80°F.
    • City B: The maximum temperature is around 95°F.
    • Answer: City B had the highest noon temperature.
  4. (d) Which city had more noon temperatures above 73°F?

    • To answer this, observe the distribution of data points above 73°F.
    • City A: Only a small portion of the data (above the median) is over 73°F, approximately from 73°F to 80°F.
    • City B: A larger portion of the data is above 73°F, extending from about 73°F to 95°F.
    • Answer: City B had more noon temperatures above 73°F.

Would you like more details on any of these questions?

Here are five follow-up questions related to this data analysis:

  1. How can you calculate the exact IQR values from a box plot?
  2. Why is the median important in understanding data distribution?
  3. What does a larger IQR indicate about the temperature variability in a city?
  4. How do outliers, if present, affect the box plot representation?
  5. Why might City B have more temperatures above 73°F?

Tip: When interpreting box-and-whisker plots, the whiskers represent the spread of the data, while the length of the box indicates the central spread of the data (IQR).

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Math Problem Analysis

Mathematical Concepts

Statistics
Box-and-Whisker Plot
Interquartile Range (IQR)
Median
Data Distribution

Formulas

Interquartile Range (IQR) = Q3 - Q1
Median: The middle value of ordered data

Theorems

Statistical Data Representation
Data Spread and Distribution

Suitable Grade Level

Grades 6-9