You just found our that your friend willard is using crystal meth. what is your number one concern?
select one:
a. he will experience withdrawal.
b. he will become depressed.
c. he will overdose.
d. he will become paranoid.

C. He will overdose

Explanation:

Although the rest of the options are very concerning. The option that he could potentially overdose is the most concerning due to the fact that it could lead to death.

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.