Skip to content  Question 27 of my final exam for Design and
Analysis of Sample Surveys  27. Which of the following problems
were identified with the Burnham et al. survey of Iraq
mortality? (Indicate all that apply.)  (a) The survey used
cluster sampling, which is inappropriate for estimating
individual out- comes such as death.  (b) In their report,
Burnham et al. did not identify their primary sampling units.
(c) The second-stage sampling was not a probability sample.  (d)
Survey materials supplied by the authors are incomplete and
inconsistent with published descriptions of the survey.
Solution to question 26  From yesterday:  26. You have just
graded an an exam with 28 questions and 15 students. You fit a
logistic item- response model estimating ability, difficulty,
and discrimination parameters. Which of the following statements
are basically true? (Indicate all that apply.)  (a) If a
question is answered correctly by students with very low and
very high ability, but is missed by students in the middl