My Math Forum Comparisons

 December 3rd, 2016, 01:52 AM #1 Member   Joined: Aug 2014 From: Mars Posts: 74 Thanks: 8 Comparisons Class has gotten to me. I can't get a hold of my teacher over the weekend so I'm hoping you guys can understand my question. There is this equation: $\displaystyle \sum c^2 = \left ( 1 \right )^{2} + \left ( -1 \right )^{2}$ that I don't understand why the second one is negative. Each number is supposed to represent a group. So if I were to compare one group to two groups I would should do this equation: $\displaystyle \sum c^2 = \left ( 1 \right )^{2} + \left (\frac{1}{2} \right )^{2} + \left (\frac{1}{2} \right )^{2}$ Why is the negative number there? I get the feeling that the question is out of context, let me know what you need from me to clarify.
 December 3rd, 2016, 11:21 AM #2 Senior Member     Joined: Sep 2015 From: CA Posts: 936 Thanks: 506 if I saw $\sum c^2 = (1)^2 + (-1)^2$ my immediate interpretation would be that $c \in \{1,~-1\}$ without further context I don't know what we can tell you. Thanks from topsquark
 December 4th, 2016, 01:59 AM #3 Member   Joined: Aug 2014 From: Mars Posts: 74 Thanks: 8 It's for psychology. The first equation is based on two groups of people only. The second equation is one group being compared to two groups.

 Tags comparisons

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post FatTwin Probability and Statistics 5 April 20th, 2016 01:01 AM nyuviolets Algebra 5 July 27th, 2015 04:23 AM mintsharpie Advanced Statistics 0 February 10th, 2013 10:08 PM restin84 Computer Science 6 October 14th, 2012 02:17 PM sangfroid Computer Science 2 November 6th, 2007 05:05 PM

 Contact - Home - Forums - Top