Frequency table or grouped data (AQA GCSE Statistics): Flashcards
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What is the formula for standard deviation from frequency tables?
What is the formula for standard deviation from frequency tables?
Standard deviation = √(Σf(x - x̄)² / Σf)
How do you calculate the mean from a frequency table?
How do you calculate the mean from a frequency table?
Mean (x̄) = Σfx / Σf
What does Σf represent in frequency tables?
What does Σf represent in frequency tables?
Σf is the total frequency, the sum of all frequencies.
Calculate mean for goals: Σfx=45, Σf=25.
Calculate mean for goals: Σfx=45, Σf=25.
Mean = 45 / 25 = 1.8 goals.
What is the second formula for standard deviation?
What is the second formula for standard deviation?
Standard deviation = √(Σfx²/Σf - (Σfx/Σf)²)
What does standard deviation measure in data?
What does standard deviation measure in data?
It measures the spread or variability of data values.
What is a common mistake when calculating standard deviation?
What is a common mistake when calculating standard deviation?
Forgetting to multiply by frequency for each value.
How do you find deviations from the mean?
How do you find deviations from the mean?
Subtract the mean from each data value.
What is the impact of rounding on statistical results?
What is the impact of rounding on statistical results?
Rounding can distort data trends and conclusions.
When do you apply the square root in calculations?
When do you apply the square root in calculations?
Apply it after summing squared values in formulas.