Estimation Lesson 3 Aims:

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Presentation transcript:

Estimation Lesson 3 Aims: • To be able to decide which distribution to use when constructing a C.I. • To practice exam style questions. • To be able to calculate the unbiased estimates for the mean and variance.

Assumptions or Theory for Summary table of which CI formula to use Parent Distribution Variance Assumptions or Theory for C I Normal X~(µ,σ2) Known Not normal Unknown Unknown Note: If sample is < 30 and not from a normal distribution we can’t use either the z or t distribution to model the situation

Unbiased Estimates of the Mean & Variance The unbiased estimate of the mean from a sample is calculated using: The variance if unknown can be calculated by using the formula below and we call it s2 rather than σ2

Jan 08 Exam Question 6 mins have a go! of Nadal’s of Nadal’s on Nadal’s

Complete relay race Do revision Exercise page 107. Qu 1 to 5 compulsory, 5 to 9 optional