Exam 3 Study Guide

# Exam 3 Study Guide - Exam 3 Study Guide BY SAMANTHA RUDA...

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Exam 3 Study Guide B Y S AMANTHA R UDA S TATISTICAL I NFERENCE (C HAPTER 6) T OPIC 14 – C ONFIDENCE I NTERVALS FOR P OPULATION P ROPORTION Π Confidence intervals for population proportions o Let p=the sample proportion o SE(p)=the standard error of p. It is the standard deviation of sampling distribution for the sample proportion Choosing adequate sample size o To achieve a desired margin of sampling error E for a given level of confidence set by z, we can solve using E = equation o Can solve for n using the same equation also T OPIC 15 - H YPOTHESIS T EST FOR P OPULATION P ROPORTION Π Hypothesis testing using z for population proportions o Used for qualitative data and testing a population proportion o Null Hypothesis: Ho: Π = Π o (or ≤ or ≥) o Alternative Hypothesis: Ha: Π Π o (or > or <) o Use test statistic z=(p- Π )/[ √Π (1- Π )]/n o The procedures for finding the p-value and making a decision remain the same T OPIC 16 – P AIRED H YPOTHESIS T EST

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Exam 3 Study Guide - Exam 3 Study Guide BY SAMANTHA RUDA...

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