Homework Help: statistics

Posted by Anonymous on Monday, May 2, 2011 at 10:33pm.

A sample of 12 measurements has a mean of 34 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 34 each.

A. Find the mean of the sample of 14 measurements.

Mean =

B. Find the standard deviation of the sample of 14 measurements.

statistics - Syed, Monday, May 2, 2011 at 11:01pm
Mean will remain unchanged as 34. but if the new values are different new mean will be computed as

12(34)+2(34)
-------------
12+2

476/14
=34

sample standard deviation

=

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