Box plots (Edexcel GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
What are the five key pieces of information shown in a box plot?
What are the five key pieces of information shown in a box plot?
Minimum, maximum, lower quartile, upper quartile, and median.
What does the interquartile range (IQR) represent?
What does the interquartile range (IQR) represent?
The middle 50% of a dataset, Q₃ - Q₁.
How do you find the median in an ordered dataset?
How do you find the median in an ordered dataset?
Locate the middle value; if even, average the two middle values.
Where do the lower and upper quartiles (Q₁ & Q₃) divide the data?
Where do the lower and upper quartiles (Q₁ & Q₃) divide the data?
Q₁ marks 25% and Q₃ marks 75% of the data.
What is the purpose of a box plot in data analysis?
What is the purpose of a box plot in data analysis?
To visually compare datasets and show data spread.
How do you interpret Q₁ = 140 and Q₃ = 220 in a box plot?
How do you interpret Q₁ = 140 and Q₃ = 220 in a box plot?
25% of data is ≤140; 25% is ≥220, IQR=80.
Why are box plots useful for comparing datasets?
Why are box plots useful for comparing datasets?
They display spread, center, and skewness visually.
What should you check before drawing a box plot?
What should you check before drawing a box plot?
Ensure data is ordered and scale is appropriate.
What is an essential step when calculating quartiles?
What is an essential step when calculating quartiles?
Order data from smallest to largest first.
Find Q1,Q2,Q3 for data: 10,11,12,17,18,18,19,23,29,35,36,41,41,48
Find Q1,Q2,Q3 for data: 10,11,12,17,18,18,19,23,29,35,36,41,41,48
Q1=17, Median=18.5, Q3=41, IQR=24