Posted by **Anonymous** on Friday, July 16, 2010 at 2:53pm.

1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the sample mean

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**PsyDAG**, Saturday, July 17, 2010 at 11:04am
95% interval = mean ± 1.96 SEm

SEm = SD/√(n-1), but you can just use n

I hope this helps.

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**John**, Saturday, December 4, 2010 at 5:55pm
45.35 to 48.65

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**John**, Saturday, December 4, 2010 at 5:56pm
(z test interval) =45.35 to 48.65

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