# lab6 - Stat 402A, HW 6 Answers 1. Drugs in mice The filled...

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Stat 402A, HW 6 Answers 1. Drugs in mice The filled in ANOVA table is: Source d.f. SS MS F p-value litter 4 6.403 drug 3 1.845 0.615 11.58 < 0.001 error 12 0.637 0.053 c.total 19 8.885 (a) 3 pt. See d.f. column above. Notes: remember blocks d.f. = # blocks - 1, trts d.f. = # trts - 1, error = product (or error = c.total d.f. - other terms), c.total = # obs - 1. (b) 2 pt. See MS, F, and p columns above. Notes: remember MS = SS / d.f., F = MS treatments / MS error . The observed F is com- pared to quantiles of the d.f.(treatments), d.f.(error) F distribution. That is the F 3 , 12 distribution. Different books have different quantiles. Most have the 0.95 and 0.99; some have more. The 0.95 quantile = 3.49, 0.99 quantile = 5.59 and 0.999 quantile = 10.8. This observed p-value is larger than the 0.999 quantile, so the p-value is < 1-0.999, i.e. < 0.001. While saying p < 0.05 is technically correct, it is useful to be as significant as possible. If you have the exact p-value (e.g. from computer output), the best approach is to report that. (c) 2 pt. s.e. of the diff = q MSE * 2 /n = q . 053 * 2 / 5 = 0 . 15. note: n is the number of blocks....
View Full Document

## This note was uploaded on 01/27/2010 for the course STAT 402 taught by Professor Staff during the Spring '08 term at Iowa State.

### Page1 / 3

lab6 - Stat 402A, HW 6 Answers 1. Drugs in mice The filled...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online