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April 1, 2015

April 1, 2015

Posted by **jacob** on Monday, December 12, 2011 at 10:10pm.

unknown distribution with mean value of 8 hours and

standard deviation of 2 hours. What is the approximate

probability that the average battery lifetime of a sample

of 36 batteries will exceed 8.1 hours?

- Statistics -
**PsyDAG**, Wednesday, December 14, 2011 at 11:03amAssuming a normal distribution,

Z = (score-mean)/SEm

SEm = SD/√n

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

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