Which factors would be considered threats to internal validity? (Select all that apply.)
A) Time
B) Selection effects
C) History
D) Testing
E) Subject availability
F) Cost
G) Selection bias

Question

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The Answer of Which factors would be considered threats to internal validity? (Select all that apply.)
A) Time
B) Selection effects
C) History
D) Testing
E) Subject availability
F) Cost
G) Selection bias

Which Factors Would Be Considered Threats to Internal Validity? (Select