Hypothesis Tests and Confidence Intervals — OCR A-Level Further Mathematics
Teaching note based on the OCR specification.
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- 5.05a Know that for any randomly and independently selected sample, Xᵢ, of size n taken from a population, then for the sample mean X̄: 1. E(X̄) = μ, 2. Var(X̄) = σ²/n and 3. X̄ is approximately normally distributed when n is large (approximately n > 25).