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av av
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6 years ago
The major threat to the internal validity of research on articulation problems in young children is
 
  a. regression.
  b. instrumentation.
  c. mortality.
  d. maturation.
  e. selection.

Ques. 2

Ex post facto research is less convincing than experimental research because
 
  a. there is no control over the dependent variables.
  b. differences in the independent variable were present before the start of the study.
  c. differences in the dependent variable were present before the start of the study.
  d. the independent variable preceded the dependent variable in time.
  e. b and c
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mcgee2mcgee2
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6 years ago
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av Author
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#2
6 years ago
All are correct
wrote...
#3
6 years ago
Happy to help
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