Grouping data (AQA GCSE Statistics): Flashcards
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What are class intervals in data grouping?
What are class intervals in data grouping?
Non-overlapping groups that organize data values.
How do you calculate class width?
How do you calculate class width?
Subtract lower boundary from upper boundary.
What is the ideal number of class intervals?
What is the ideal number of class intervals?
Aim for 5-10 intervals for effective grouping.
Why use inequality notation for continuous data?
Why use inequality notation for continuous data?
It prevents gaps and clarifies boundary values.
What intervals to use for heights 147 cm to 174 cm?
What intervals to use for heights 147 cm to 174 cm?
Use intervals like 145-150, 150-155, etc. up to 175.
What happens if a value is exactly on a boundary?
What happens if a value is exactly on a boundary?
It belongs to the interval starting with that value.
What is a common mistake in interval grouping?
What is a common mistake in interval grouping?
Leaving gaps between intervals for continuous data.
How to represent intervals clearly?
How to represent intervals clearly?
Use inequality notation like 2.0 < w ≤ 2.5.
What should you check when creating intervals?
What should you check when creating intervals?
Ensure they cover the full range of your data.
Can intervals have different widths?
Can intervals have different widths?
Yes, adjust based on data distribution.