Cumulative frequency diagrams 1 (AQA GCSE Statistics): Flashcards
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What does cumulative frequency represent in data?
What does cumulative frequency represent in data?
It shows how many observations fall at or below a value.
How do you create a cumulative frequency table?
How do you create a cumulative frequency table?
Add each frequency to the sum of all previous frequencies.
Why use step polygons for discrete data?
Why use step polygons for discrete data?
They show constant cumulative frequency until the next value.
Where to plot cumulative frequency for continuous data?
Where to plot cumulative frequency for continuous data?
At the upper bound of each class interval.
What is the first step in plotting a cumulative diagram?
What is the first step in plotting a cumulative diagram?
Start at zero at the lower bound of the first interval.
How do you plot cumulative frequency points?
How do you plot cumulative frequency points?
Plot at upper bounds and connect with lines or curves.
What should the final cumulative frequency equal?
What should the final cumulative frequency equal?
It should equal the total number of observations.
Example: Cumulative frequency for ≤130 is 8. What next?
Example: Cumulative frequency for ≤130 is 8. What next?
Add the next frequency to 8 for the next cumulative total.
What does a smooth curve indicate in cumulative graphs?
What does a smooth curve indicate in cumulative graphs?
It shows continuous data points connected smoothly.
If cumulative frequency for ≤140 is 24, what is ≤130?
If cumulative frequency for ≤140 is 24, what is ≤130?
It is 16, as it includes all values up to 130.