Cell Phone Observer
May 13th, 2011
stats help?
Data collected by observers at randomly selected intersections across the country revealed that in a sample of 1,165 drivers, 35 were using their cell phones.
compute a 95% confidence interval for p.
P is the proportion that were yacking — 35/1165.
The standard error of the proportion defective (let’s call it ‘s’ here) is sqrt(p(p-1)/n) where n is the sample size –1165).
The 95% confidence interval is between p-1.96s and p+1.96s where 1.96 is the Z value for 47.5% of the area to either side of the standard normal curve.
International Observer – Cellphone Dub
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