📝 Practice Worksheets
🔑 Key Concepts
- The interquartile range (IQR) measures the spread of the middle 50% of a data set.
- IQR is calculated using \( IQR = Q3 - Q1 \).
- Q1 is the median of the lower half of the data, and Q3 is the median of the upper half.
- When the data set has an even number of values, quartiles are found by splitting the data into two equal halves.
- IQR helps describe how spread out the central portion of the data is.
💡 Main Idea
This lesson focuses on calculating the interquartile range from a set of data. Students learn how to identify Q1 and Q3 by splitting the data into halves and finding the medians of each section. Once these values are found, the IQR is calculated to describe the spread of the middle half of the data.
📚 What You Should Already Know
Students should know how to order data from least to greatest and find the median of a data set. They should also understand how to divide a data set into two equal halves.
🚀 What Comes Next
After this lesson, students can apply IQR to box plots, compare data sets, and use measures of spread to describe variability more precisely.
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