Danny is conducting an archival study where he is attempting to select medical records from a ...

Danny is conducting an archival study where he is attempting to select medical records from a hospital's database such that the selected files mirror the larger collection's characteristics and traits. It appears that Danny is concerned about
 
  a. his sample's representativeness.
  b. the internal validity of the study.
  c. establishing a proper control group.
  d. implementing a double-blind procedure.

Question 2

Archival data typically consist of
 
  a. data collected under controlled laboratory conditions.
  b. data collected through written survey instruments.
  c. records of behavior in written or electronic formats.
  d. theoretical data produced by computerized models.