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May 1st, 2015, 11:12 PM  #1 
Member Joined: Dec 2012 Posts: 38 Thanks: 0  Quick Statistics Question
Hey all  haven't been back for a while. Fiancé is taking Statistics in Justice Studies class and we are reading the book but cannot understand for the life of me why the Summation (E) sign has no explanation on how to solve. We understand everything else but can't get to the Summation formula. I know that Summation is X1+X2...XN but it doesn't work in this case as they have the XD pieces involved. Any idea on how they got to the answer 2.12 number there at the bottom? Screenshot attached below. http://mymathforum.com/attachment.ph...1&d=1430550722 
May 2nd, 2015, 02:09 AM  #2  
Senior Member Joined: Jan 2012 From: Erewhon Posts: 245 Thanks: 112  Quote:
CB  
May 2nd, 2015, 02:29 PM  #3 
Member Joined: Dec 2012 Posts: 38 Thanks: 0 
Thank so much Captain... that makes so much sense now I can do the rest of the problems... I just needed that formula. Also, struggling a bit with the last problem of the practice... Final exam is coming up so I am taking the practice exam and it is not making much sense to me. Any idea on how to put this into a formula so I can solve? Oh and these are the five steps it gives me... Step 1. State the Null and Alternative Hypotheses Step 2. Identify the Distribution and Compute the Degree of Freedom Step 3. Identify the Critical Value and State the Decision Rule Step 4. Calculate the Obtained Value of the Test Statistic Step 5. Make A Decision About the Null and State the Substantive Conclusion 

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