Which of the following is false regarding internal validity?
A) Internal validity exists when a relationship between two variables is causal.
B) In other words, each of the variables must vary together.
C) However, the direction of the change between variables does matter.
D) The covariance between variables may result from some unknown variable(s) called exogenous variables.
Correct Answer:
Verified
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Q23: Among various threats to internal validity, _
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