- Reminder: please hide your rectangles.
- You'll have a quiz at the end of the hour, over packet 4.
- Your first exam is next week, Thursday.
- The exam will cover everything through packet 5.
- Questions will resemble those of IMath homework, and the packets. Study both to prepare yourself.
- You'll need only a calculator and writing utensil (maybe a couple, of different colors). That's it. (You may not use a cell for a calculator.) Make sure that you have a calculator -- and know how to use it.
- You'll receive a standard normal table and formula sheet.
- Come prepared with questions for Tuesday. I'll do a short review of the material to be covered, and then open up the floor for questions.
- We finished up talking about errors in hypothesis testing,
(sometimes we make mistakes while
testing):
Think about a trial: the null hypothesis ($H_0=$ "innocent" until proven guilty); alternative, $H_a\ne$ "innocent".
So a Type I error is "Reject a true null" -- the individual is innocent, but we send them to jail.
What is a Type II error?
- We also started Packet 5: confidence intervals for a proportion.
- We wrap up Packet 5, which
has two major objectives:
- estimate parameter $p$ using statistic $\hat{p}$, with given confidence, and
- discover the sample size needed to estimate $p$ to a given tolerance with given confidence.
Last time we learned how to create a confidence interval for $p$. Today we'll add in the calculation of sample size.