Range, quartiles and interquartile range (Edexcel GCSE Statistics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the formula for estimating the range in grouped data?
What is the formula for estimating the range in grouped data?
Largest - Smallest
What is the purpose of calculating quartiles in grouped data?
What is the purpose of calculating quartiles in grouped data?
To divide data into four parts
Which quartile marks the 25% point of data?
Which quartile marks the 25% point of data?
Q1
What does the interquartile range (IQR) measure?
What does the interquartile range (IQR) measure?
Middle 50% spread
How do you find the position of Q3 in grouped data?
How do you find the position of Q3 in grouped data?
3n/4
What is the formula for linear interpolation in quartile calculations?
What is the formula for linear interpolation in quartile calculations?
L + (pos - CF)/f * c
What should students remember regarding estimates in grouped data?
What should students remember regarding estimates in grouped data?
Approximate values
What is the main benefit of using IQR instead of range?
What is the main benefit of using IQR instead of range?
Less affected by outliers
Using the travel distance table (n=120), estimate Q2 (median) by interpolation.
Using the travel distance table (n=120), estimate Q2 (median) by interpolation.
8.4 km
Estimate Q1 using linear interpolation for grouped data: 0<x≤5 (f=34), 5<x≤10 (f=38), 10<x≤15 (f=22); n=120.
Estimate Q1 using linear interpolation for grouped data: 0<x≤5 (f=34), 5<x≤10 (f=38), 10<x≤15 (f=22); n=120.
4.41 km