Histograms and area keys (AQA GCSE Statistics): Flashcards
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What does an area key represent in a histogram?
What does an area key represent in a histogram?
It shows frequency per small square in the histogram.
How do you find frequency using an area key?
How do you find frequency using an area key?
Count squares, then multiply by the area key value.
How to calculate total frequency from squares and fish?
How to calculate total frequency from squares and fish?
Multiply number of squares by fish per square.
How to calculate frequency from frequency density?
How to calculate frequency from frequency density?
Frequency = frequency density × class width.
How to check your frequency calculations?
How to check your frequency calculations?
Verify totals and ensure they make sense contextually.
What common mistake to avoid with area keys?
What common mistake to avoid with area keys?
Don't confuse frequency with frequency density.
How to handle partial squares in histograms?
How to handle partial squares in histograms?
Estimate the fractional part carefully when counting.
What is the class width for 20 < t ≤ 50?
What is the class width for 20 < t ≤ 50?
Class width = 50 - 20 = 30.
Why are area keys useful for unequal class widths?
Why are area keys useful for unequal class widths?
They simplify frequency calculations without density.
What is the first step in solving an area key problem?
What is the first step in solving an area key problem?
Determine the area value for each small square.