General instructions. Please write your name and student ID at the top of every page you hand in. Please collate and staple your pages together. Please write clearly and thoroughly explain all your computations; an unannotated series of formulas that mysteriously ends up with the correct number will not be given full credit. When doing the homework, you are encouraged to use all resources at your disposal to the extent that they help you learn the material; nevertheless, you must write your own answers in your own words.

1. (4 pts.)
   p. 752, #5. Please write your answers in your own words.

2. (4 pts.)
   p. 752, #8. Please write your answers in your own words.

3. (12 pts.)
   p. 755, #15. Feel free to use SPSS or the Excel spreadsheets as you feel appropriate, but explain your work and keep your answers uncluttered and clear.
   HINT: First, notation for this hint. The levels of Group are denoted Lar for Larger and Sma for Smaller. The levels of IBI are denoted Bas for Baseline and Fee for Feedback. Thus, particular cells are denoted LarBas , LarFee, SmaBas, and SmaFee. The interaction contrast in part (a) is [ LarBas - LarFee ] - [ SmaBas - SmaFee ]. The comparison in part (b) is [ LarFee - LarBas ] - [ SmaBas - SmaFee ]. Think about why. How do those comparisons relate to each other?