Posted by Misty on Saturday, September 29, 2012 at 2:20pm.
A sample has a mean of M = 25. If one person with a score of X = 25 is added to the sample, what effect will it have on the sample mean?
Why and how is there no effect on the sample mean? I am not really understanding this?

Math Statistics  Ms. Sue, Saturday, September 29, 2012 at 2:30pm
Study this explanation of mean. The answer should be clear to you then.
http://www.mathsisfun.com/mean.html

Math Statistics  PsyDAG, Saturday, September 29, 2012 at 4:15pm
The mean functions as a fulcrum/balance point for the distribution. Since the score is added at the balance point, the mean does not change.
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