One of the common elements of the eight case studies in Chapter 1 ...

[Chloeellawright]

One of the common elements of the eight case studies in Chapter 1 is
 a. in each case, a randomized experiment is described.
  b. in each case, an observational study is described.
  c. in each case, confounding variables are a problem.
  d. in each case, data are used to make a judgment about the situation.

Question 2

An organization would like to conduct a survey of a sample of their membership to make conclusions about the entire membership. Given that they have a limited budget, they should focus their attention on
 a. getting as large a sample as possible, even if they are all volunteers.
  b. getting as large a sample as possible, even if they are not representative.
  c. getting a representative sample.
  d. getting a self-selected sample.

[lou]

Answer to Question 1

D

Answer to Question 2

C

[Chloeellawright]

Both answers were spot on, thank you once again

[lou]

Great! Please up vote