Day 24: Statistics for Business Applications

Last Time: More on testing the difference in two means
- The variable is the difference between a matched pair
- Reduces to a standard t-test on the variable X_D, the difference in the pair
- Paired differences test provides more "power" than the test on independent samples
Collect homework 13.1-2
Change in plans
Next time (Tuesday): Collect problems 13.4
We've moved that back to Thursday.
If you wish, you may hand in the review exercises to replace another homework assignment.
If you wish to hand in the chapter 12 review problems, do so by Thursday, 4/17.
Questions about old stuff?
Today: More on the difference between two means (paired samples):
Examples and practice calculations:
- Examples contrasting the paired and unpaired (independent) approach
  - Good luck!
  - ADHD
- Example: #13.66, p. 411
- Practice Calculation Exercise 13.60, p. 424
  - (Warning to confidence interval testers!)
- What can we learn from our classmates?
  - We've already learned that NKU men are taller than NKU women.
Next time: Differences in proportions (Section 13.6)

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