Day 24: Statistics for Business Applications

Last Time: More on testing the difference in two means (golfing example); intro to matched pair test
- 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 (or not: you can hand it in next time)
Collect problems 13.4 next Thursday.
Questions about old stuff?
- Exercise #13.33, p. 409
- Exercise #13.34, p. 409
Today: More on the difference between two means (paired samples):
Examples and practice calculations:
- Examples contrasting the paired and unpaired (independent) approach
  - ADHD
  - Good luck! (Is that p-value right?)
- Example: 13.69, p. 425
  - Try matched (Try unmatched!)
  - "Scatterplot"
- Example: #13.66, p. 425
- Practice Calculation Exercise #13.60, p. 424
Next time: Differences in proportions (Section 13.6)

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