The history threat refers to the possibility that ____
a. because of their personal experiences, some subjects will be uncooperative
b. most important research in the social sciences has already been done
c. events external to the experiment that will impact the results
d. the experiment will be judged to be unimportant
C
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According to the text, more than half of all police departments require officers to wear protective body armor while working
a. True b. False
Which of the following may an officer do during a traffic carstop?
A) Order the driver and any suspicious passengers out of the car B) Order the driver and passengers out of the car C) Order only the driver out of the car D) Not order anyone out of the car without reasonable suspicion
The correlation between two variables can be positive or negative
a. TRUE b. FALSE
Barbiturates are examples of ______.
a. depressants b. stimulants c. hallucinogens d. narcotics