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MGMT305-Lec5

# Politicalscienceincpsi specializesinvoterpollsand

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Unformatted text preview: opulation proportion is population proportion is p ± Margin of Error p The sampling distribution of plays a key role in The sampling distribution of plays a key role in computing the margin of error for this interval computing the margin of error for this interval estimate. estimate. p The sampling distribution of can be approximated The sampling distribution of can be approximated by a normal distribution whenever np > 5 and by a normal distribution whenever np > 5 and n(1 – p) > 5. n(1 – p) > 5. Slide 24 Interval Estimation of a Population Proportion s Normal Approximation of Sampling Distribution of Sampling distribution of p α/2 σp = 1 ­ α of all p values zα / 2 σ p p p p(1 − p ) n α/2 p zα / 2 σ p Slide 25 Interval Estimation of a Population Proportion s 100(1­α)% Confidence Interval Estimate of p p ± zα / 2 p (1 − p ) n where: 1 ­α is the confidence coefficient zα/2 is the z value providing an area of α/2 in the upper tail of the standard normal probability...
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