Comparative pie charts (AQA GCSE Statistics): Flashcards
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What is the key principle of comparative pie charts?
What is the key principle of comparative pie charts?
Size of each pie chart is proportional to group size.
How do you find the sample size using pie chart radii?
How do you find the sample size using pie chart radii?
Use the formula: R²/r² = N/n.
What is the ratio of sample sizes for R=4 and r=3?
What is the ratio of sample sizes for R=4 and r=3?
The ratio is 16:9 based on R^2:r^2.
What is 90° of a 360° total in terms of proportion?
What is 90° of a 360° total in terms of proportion?
90° represents 1/4 or 25% of the total 360°.
What mistake should you avoid with pie chart angles?
What mistake should you avoid with pie chart angles?
Equal angles do not mean equal numbers of people.
Calculate people from 72° in a 200 sample size.
Calculate people from 72° in a 200 sample size.
Number = (72/360) * 200 = 40 people.
Find 2017 sample size if 2016 is 200 and R=4.5, r=3.
Find 2017 sample size if 2016 is 200 and R=4.5, r=3.
N = 450 people using R²/r² = N/n.
What does a larger pie chart indicate?
What does a larger pie chart indicate?
It represents a larger sample size.
How to compare data from two pie charts effectively?
How to compare data from two pie charts effectively?
Use actual numbers, not just angles.
If 72° represents 40 people, how many for 450 total?
If 72° represents 40 people, how many for 450 total?
Number = (72/360) * 450 = 90 people.