PSYC 5 – Discussion: Does Z scores help

Can you help me understand this Statistics question?

Discussion topic: Variance ~ help me understand it! by due date (to do so, just click the “reply” button below). In your post please include the following:

  1. What is the one thing you need help on.

Please reply to at least one other student’s post. In your reply, please do one of the following: Help Each Other!!!

  1. Offer your help, if you understand it.
  2. Ask for help of clarification from you classmate.
  3. Ask: did I calculate this right

_________________________________ Respond to


My question regarding z-scores piggy-backs on my response to Anna’s post above regarding why +/- 2.00 is considered the extreme boundary. When referencing the Unit Normal Table, I see that z-scores are listed from 0.00 to 4.00. Yet, I’m halfway through Chapter 7 and haven’t seen a distribution graph with a z-scores above or below 2. Is it a low probability and very rare that z-scores ever go beyond -2/+2? This is jumping ahead, but does that “arbitrary” boundary relate to the concept of sample means piling up in the center of the distribution (chapter 7)?


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