A cause-and-effect relationship between two variables can best be determined from which of the following?
A) A controlled experiment where the observational units are assigned randomly.
B) When the two variables have a correlation coefficient near 1.
C) A survey conducted using a simple random sample of individuals.
D) An observational study where the observational units are chosen randomly.
E) A survey conducted using a stratified random sample of individuals
Answer: a controlled experiment where the observational units are assigned randomly
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