Day 26: STA205 - Introduction to Statistical Methods

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• Announcements:
  • Your quiz is returned.
    • Important: In an hypothesis test we either
      • Reject Ho
      • Fail to reject Ho
      That's it. We do not "accept Ha", we do not "reject Ha", we do not "Accept Ho". We never ever really believe Ho: is $\mu=10$? No: perhaps 9.9778, but not really 10!

  • Your next IMath homework over Packet 11 is due tomorrow.

  • Your Packet 12 IMath homework is due next Tuesday.

• Today:
  • Today we actually do wrap up Packet 11: Two Sample inference.

    Only two more topics to follow!

  • Then we move on to Packet 12: ANOVA (we could say "multi-sample" inference (instead of just "two").

    "ANOVA" stands for "Analysis of Variance". Variance is another measure of spread or "variability": the square of the standard deviation. We will tend to use the ranges in the graphics to represent spread, and to give us some idea of the "F statistics" calculated.

    In this course we consider it more important to gain an intuitive idea behind the F statistic, rather than a computational one.

    By the way, the two sample unpaired design we just studied in Packet 11 is equivalent to ANOVA with just two samples.

  • Only one more topic to follow! (Regression -- but it's a really, really important one!)

• Links:
  • The Standard Normal Table of probabilities.