# Stat 1053-10 informal notes 10-19-12 - HW for credit is due...

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HW for credit is due in discussion next week (10/23).RecallFormula for large-sample CI for μ(Section 7.2)100(1- α)% CI for μ is(-zα/2σ, + zα/2σ ),where zα/2is a value from the Z-table,is the samplemean, and σ= σ/ (√n).Note: ,σ, and n come from the word problem;you have to get zα/2from the Z-table, usingconfidence coefficient (1- α).(-zα/2σ, + zα/2σ ) =(-zα/2σ/ (√n), + zα/2σ/ (√n) ) uses the population sdσ.If the population sd σ is not known, use the samplestandard deviation s (Chapter 2) instead; the CIformula becomes(-zα/2s/ (√n), + zα/2s/ (√n)).
Large sample confidence interval (CI) for p (Section7.4)Background: binomial type situation – havesuccesses and failures, eg, household tunes in to ashow or does not.Population proportion p,Sample proportion (from a sample of size n)
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