Comparing box plots | Maths | Quizalize & Oak National Academy

Starter quiz

The vertical line inside the box of a box plot represents the ______.

'median' ✓
What is the height of the tallest person?

'146 cm' ✓
What is the lower quartile height?

'115 cm' ✓
What is the upper quartile of this set of data? 17, 13, 19, 21, 13, 14.

'19' ✓
Below is the box plot for this set of data: 17, 13, 19, 21, 13, 14. What is the value of point A on the box plot?

'13' ✓
Below is the box plot for this set of data: 17, 13, 19, 21, 13, 14. What is the value of point D on the box plot?

'19' ✓

Exit quiz

Anything below the __________ represents 25% of the data.

lowest value

lower quartile ✓

median

upper quartile

highest value
Anything below the upper quartile represents what percentage of the data?

'75%' ✓
What is the range of the middle 50% of data?

'16 cm' ✓
A ______ box indicates data that is more consistent.

'narrower' ✓
Which class did better on average?

'B' ✓
Which class has more consistent scores?

'A' ✓

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

A box plot allows us to make conclusions about the data set
Box plots can be compared to highlight similarities/differences in data sets
The box part tells us about the middle 50% of the data

Common misconception

Not referring to the context of the question when comparing the data.

Highlight that just saying the median or the middle 50% of data is bigger is of little use unless you know what the data was about. Check that pupils understand the context of the question.

Keywords

Box plot - A box plot is a diagram that clearly shows the minimum and maximum value of a data set along with the three quartiles.
Median - The median is the central (middle) piece of data when the data are in numerical order. It is a measure of central tendency representing the average of the values.
Range - The range is a measure of spread. It is found by finding the difference between the highest and lowest values.