Grouping data (Edexcel GCSE Statistics): Flashcards
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Practise the cards
9 cards from this deck
Why do we group data in statistics?
Why do we group data in statistics?
To see distribution clearly and identify trends.
What are class intervals?
What are class intervals?
Non-overlapping groups that data fits into exactly one.
How do you find class width?
How do you find class width?
Subtract lower boundary from upper boundary of a group.
How to handle continuous data correctly?
How to handle continuous data correctly?
Use inequalities, e.g., 150 ≤ h < 155.
What is the benefit of grouping data?
What is the benefit of grouping data?
Reveals trends and simplifies large datasets.
When are too many groups a problem?
When are too many groups a problem?
Over 12 groups can make patterns hard to see.
Find class width for 150≤h<155
Find class width for 150≤h<155
Class width = 155 − 150 = 5 cm
Which interval contains 155.0: 150≤h<155 or 155≤h<160?
Which interval contains 155.0: 150≤h<155 or 155≤h<160?
155≤h<160 — 155 included here (not in 150≤h<155)
Create 5 intervals for heights 147.9–174.4 cm
Create 5 intervals for heights 147.9–174.4 cm
145≤h<150,150≤h<155,155≤h<160,160≤h<170,170≤h<175