ZIMSEC · Form 6 · Upper 6 · Syllabus 6046
Statistics
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- Discrete random variables, binomial and Poisson distributions A probability distribution lists values x with probabilities summing to 1.
- The normal distribution X ~ N(μ, σ²) is continuous, symmetrical and bell-shaped about the mean μ. About 68% of values lie within 1σ of the mean, 95% within 2σ (1.96σ exactly) and 99.7% within 3σ.
- Sampling and estimation Simple random, systematic, stratified, quota, cluster and convenience sampling. Good samples are representative and free from bias.
- Hypothesis testing Type I error: rejecting H₀ when it is true (probability = significance level). Type II error: accepting H₀ when it is false.
- Correlation and regression Show the relationship between two variables: positive, negative or no correlation; linear or non-linear.