When a post-facto relationship is found between two variables A and B, it
is always possible, though not certain, that
a. A caused B
b. B caused A
c. a third variable, X, has caused A plus B
d. all of these
d
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_______________ are DNA segments that vary considerably among individuals and whose locations on the chromosome are already known
a. Bases b. RNA c. Genomes d. Genetic markers
Because the effects of stimulants and depressants counteract each other, taking these drugs in combination does not produce intoxication
Indicate whether the statement is true or false
Drugs that produce euphoric feelings are psychoactive substances
Indicate whether the statement is true or false
Which of the following statistical techniques evaluates the difference between two means?
a) t tes b) Correlation coefficient c) Standard deviation d) Mean