Day 20: STA205 - Introduction to Statistical Methods

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• Announcements:
  • Your quiz is returned.

  • Your next IMath homework is due tomorrow.

• Today:
  • Today we wrap up Packet 9: Hypothesis Test for the Mean

    This is the last section to be covered on your next exam (which will cover 6-9).

    We use the sample standard deviation $s$ to estimate the population standard deviation $\sigma$, which means that the normal distribution assumption won't fly anymore.

    We'll have to swap in the t-distribution for the normal distribution. But don't panic!

    Now they look a lot a like, but the problem is that as the sample size changes, the t-distribution changes: so you'd need a table for each sample size. That would be a lot of tables! The good news is that software takes care of all of that, so, once again, we'll be relying on StatCrunch output to do our work.

    

• Links:
  • The Standard Normal Table of probabilities.