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The problem asks for a measure of how much the plants' heights varied. The key concept for variation in this context is represented by the **interquartile range (IQR)**, which is a measure of statistical dispersion or variability. It tells us the spread of the middle 50% of the data. 

In this case, the interquartile range is given as **3.4 centimeters**, which indicates how much the central half of the plants' heights varied.

Thus, the correct answer is **3.4 centimeters**.

Would you like more details or have any further questions?

Here are 5 related questions for further exploration:
1. What is the interquartile range, and how is it calculated?
2. How does the median differ from the mean as a measure of central tendency?
3. Why is the interquartile range a better measure of variation than the range in some cases?
4. Can you explain the significance of quartiles in a data set?
5. How do outliers affect the interquartile range and the range?

**Tip:** The interquartile range is resistant to outliers, which makes it a more reliable measure of variation when the data contains extreme values.

Which is a measure of how much the plants' heights varied?

Learn how the interquartile range (IQR) measures variation in plant heights, with an IQR of 3.4 centimeters showing how much the plants' heights varied. The median height is 8.8 centimeters, and all plants were at least 6 centimeters tall, with the tallest reaching 14 centimeters. Suitable for students in Grades 6-8.

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