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December 9, 2016

Homework Help: statistics

Posted by PK on Tuesday, February 21, 2012 at 4:28pm.

The population standard deviation (σ) for a standardized achievement test that is normally distributed is 8.  
 a.) Calculate the standard error of the mean if you draw a random sample of 50 test scores.  Show your work for full credit .  .  .
 b.) Your sample mean is calculated to be 77.  Compute the 95% confidence interval for the mean.  Show your work!
 c.) Interpret the meaning of the 95% confidence interval in one sentence.

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