Posted by chris on Thursday, April 4, 2013 at 11:18pm.
In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean number of cars per person.
I think I know the formula 99%=0.504 + 1.96 SEm but is the SEm 1.96?

stats.  PsyDAG, Friday, April 5, 2013 at 12:07pm
SEm = SD/√n
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