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Concise resources for the CIE A Level Maths: Probability & Statistics 1 course. 1. Data Presentation & Interpretation. 2. Probability. 3. Statistical Distributions. Revision notes for the CIE A Level Maths: Probability & Statistics 1 syllabus, written by the Maths experts at Save My Exams.
NORMAL DISTRIBUTION FINDING PROBABILITIES q State the mean and variance (standard deviation) q Standardise to find the z value q Sketch a graph and shade in the area to represent the probability q Use the table to find the probability – - take care with negative z-values – P(z > -0.8) = P(z < 0.8) P(z < -0.8) = 1 – P(z < 0.8)
Statistical modelling Example: When a die is rolled, we say that the probability of each number is 1 6. This is a statistical model, but the assumption that each face is equally likely might not be true. Suppose the die is weighted to increase the chance of a six. We might then find, after experimenting, that the probability of a six is 1 4
A statistical model is a simplification of a real world situation, usually describing a real world situation using equations. It can be used to make predictions about a real world problem.
Comparing two distributions from a back to back stem and leaf diagram. When deciding class boundaries you must not leave a gap between one class and another, whether dealing with continuous or discrete distributions.
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