The question of whether the observed effects on the test units could have been caused by variables other than the treatment refers to:
A) external validity
B) internal validity
C) possible instrumentation effects
D) possible concomitant variation
Correct Answer:
Verified
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Q29: _ is the basic minimum _ that
Q30: The _ are the entities to whom
Q32: If physical control,randomization,and design features do not
Q33: Under which conditions can researchers claim a
Q34: The _ effect refers to the occurrence
Q35: Getting older,growing hungrier,and developing fatigue are examples
Q36: Laboratory settings generally offer lower control over
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