(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

You look at a random sample of 64 vehicles in one school parking lot and find that 24 are trucks. Determine the 80% confidence interval for the true population proportion of trucks in all the school lots.

2. Relevant equations

(work shown below)

3. The attempt at a solution

(24) / (64) = 0.375

σ = (.375(1-.375)) / (64)^2 = 0.605

80% + ((1 – 8%) / 2) = 90% = 0.9

z=1.28 ~ 0.9

Margin of error = 1.28 * 0.0605 = 0.07744

LL= .375 - .07744 = .29756

UL= .375 + .07744= .45244

(.29756, .45244)

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# Homework Help: Statistics help, Confidence interval!

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