Pearson EdexcelWST01
A Level Statistics 1: Complete Study Guide & Past Papers
GradeMax provides comprehensive A Level Statistics 1 revision with real past paper questions organized by topic. Practice probability, data representation, correlation, regression, and discrete random variables.
5Topics
11Years of Papers
2014-2024Coverage
A Level Statistics 1 (S1) Topics
1
Data Representation
Histograms, stem and leaf diagrams, box plots, and cumulative frequency.
histogramsbox plotsstem and leaf
2
Measures of Location and Spread
Mean, median, mode, range, IQR, variance, and standard deviation.
meanmedianvariance
3
Probability
Addition and multiplication rules, conditional probability, and tree diagrams.
probabilityconditional probabilitytree diagrams
4
Correlation and Regression
Scatter diagrams, correlation coefficient, and linear regression lines.
correlationregressionscatter diagrams
5
Discrete Random Variables
Probability distributions, expected value (E(X)), and variance (Var(X)).
discrete random variablesexpected valuevariance
Past Papers by Year
Frequently Asked Questions
What is the formula for standard deviation?
Standard deviation σ = √[Σ(x-μ)²/n] or σ = √[Σx²/n - (Σx/n)²]. For sample standard deviation, use (n-1) in the denominator instead of n.
How do you calculate correlation coefficient?
PMCC (r) = Sxy/√(Sxx × Syy), where Sxy = Σxy - (ΣxΣy)/n, Sxx = Σx² - (Σx)²/n, Syy = Σy² - (Σy)²/n. r ranges from -1 to +1.
What's the difference between correlation and regression?
Correlation measures the strength of linear relationship between two variables (-1 to +1). Regression finds the equation of the line of best fit to predict y from x (y = a + bx).
How do you find E(X) and Var(X)?
E(X) = Σx×P(X=x) (sum of each value times its probability). Var(X) = E(X²) - [E(X)]² = Σx²×P(X=x) - [E(X)]².
When do you use P(A∩B) vs P(A∪B)?
P(A∩B) = probability of A AND B both happening. P(A∪B) = probability of A OR B (or both). P(A∪B) = P(A) + P(B) - P(A∩B).
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