Re: ISI 2015 PEA Answer Key - Discuss

Posted by onionknight on Apr 30, 2015; 10:03am
URL: http://discussion-forum.276.s1.nabble.com/ISI-2015-PEA-Answer-Key-Discuss-tp7596123p7596442.html

Adding the same constant 'a' to all the observations increases the value of mean by
a. However, adding the same constant 'a' to all the observations does not change the value
of s. That’s because adding a constant 'a' to all data values shifts the location of the data but
does not affect its spread.
For more proof, see the second page: http://faculty.uncfsu.edu/dwallace/lesson%206.pdf