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Unformatted text preview: Stat 512 - Assignment 2 Due Monday, February 22 1. An experiment was conducted to test the effects of different diets on turkeys. Thirty turkeys were randomly assigned to five diet groups, six per group. The measured response is weight gain (in pounds). Group Weight gains Control diet only 4.1 3.3 3.1 4.2 3.6 4.4 Control diet + level 1 of additive A 5.2 4.8 4.5 6.8 5.5 6.2 Control diet + level 2 of additive A 6.3 6.5 7.2 7.4 7.8 6.7 Control diet + level 1 of additive B 6.5 6.8 7.3 7.5 6.9 7.0 Control diet + level 2 of additive B 9.5 9.6 9.2 9.1 9.8 9.1 (a) What can you conclude from the omnibus F test? (b) Define a set of four contrasts that compare each of the last four groups to the control group. Are these contrasts orthogonal? Which contrasts are significant at the .05 level? What level of significance should you require for the individual contrasts to maintain a familywise error rate (i.e. the probability of rejecting at least one null hypothesis if all null hypotheses are true) of .05? Which contrasts are significant at this level?are true) of ....
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This note was uploaded on 01/19/2012 for the course STAT 512 taught by Professor John during the Spring '11 term at Peru State.
- Spring '11