When using the method of concomitant variation, it is necessary to have a measur-
ing system already established.
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Verified
Q10: We can legitimately infer cause from effect
Q11: A necessary condition for the occurrence of
Q12: We can never completely confirm a causal
Q13: "Double-arm" trials, in which one group receives
Q14: Scientists cannot use the method of residues
Q16: Matching:
-When researchers study hundreds of families to
Q17: Matching:
-"Knockout mice" that are missing a crucial
Q18: Matching:
-The method of _ differs from the
Q19: Matching:
-To say that A causes B is
Q20: Matching:
-A _ condition describes a circumstance in
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