Day 16: STA205 - Introduction to Statistical Methods

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• Announcements:
  • Have a great spring break!

• Today:
  • We wrap up Packet 6, which has as its major objective determining whether two (categorical) variables are independent of each other or whether they are related to each other.

    I've mentioned this issue in other packets: for example, we're studying violent behavior in KY adults, but if our sampling frame excludes felons, say, we might be skewing our results (if there is indeed a relationship between violent behavior and felon status -- so we might want to study that!).

• Links:
  • The Standard Normal Table of probabilities.
  • Computing chi-squares in Statcrunch is carried out using the

    Stat -> Tables -> Contingency ->

    (then either data or summary, depending on what you have)

  • Here's a Mathematica demo about Chi-Squares.