Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Courses » ap-stat

Topic: Acorn book question
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  
egilcreast

Posts: 6
Registered: 12/6/04
Acorn book question
Posted: Apr 12, 1997 10:53 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Sorry, made a typing error in my previous message. If two populations have
means 424 and 478 and each had standard deviations 100, why isn't the standard
deviation of the sum equal to sqrt(100^2 + 100^2)? Means are additive and I
thought variances were additive too. The Acorn book says there's not enough
information. Philip Mallinson





Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.