HW1 Grading Key (Biostat) Assigned 8/30; due 9/6; returned 9/13 [Answers to 1.3, 1.7, and 1.9 are online in their usual location]

Hard copy keys are for even numbered problems only. Odd numbered answer are posted in usual location (linked to exercises).

Point number Key
1) _____ (Subscribed)
2) _____ (Profile includes name)
groups.yahoo.com/group/hs167  The week 1 assignment was explicit in requiring each student to join the group and have a profile so that we can have meaningful discussions about the class and HW online.

3) _____ (pop)
4) _____ (sample)

(1.4) Diabetic body weight
Population = 35- to 44-year old male diabetics
Sample = the 18 diabetics in the study 
This question will not graded. We do not grade every item. Graded problems are selected at random before HW is handed to avoid possible selection bias.

(1.8) Drug toxicity in chemo patients 
(A) Measurement scales: AGE - quantitative, SEX - categorical, MANUF  - categorical, DIAG -  categorical 
STAGE - categorical. TOX - categorical, DOSE - quantitative, SCR - quantitative, WEIGHT - quantitative
(B) 49
(C) "leukemia"

5) _____ (A)
6) _____ (B)
7) _____ (C)

(1.10) Variable 2
(A) quantitative 
(B) quantitative 
(C) quantitative 
(D) categorical - some students will get this wrong if they printed too early a version of the HW. HW instructions were explicit in noting version of 8/29/05 or later.
8) _____
9) _____
10) _____
Free points You handed your HW in on time, so why not enjoy some refreshing free points?