LSD has a relatively _____ level of toxicity in terms of its lethal dose.
A) low
B) medium
C) high
D) extremely high
Answer: A) low
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What serve as chemical messengers and assist the communication between immune cells?
A. Macrophages B. Cytokines C. Neurons D. B-cells
A teacher wants to see if there are any differences in the test scores of students who take her exam on the computer and those who take her exam the traditional paper and pencil way. Students with an odd digit at the end of their student ID number are required to take her midterm exam on the computer and those with an even digit are required to take a paper and pencil exam. Her study has a _____
sample with _____. a. random / random assignment b. convenience / random assignment c. convenience / nonrandom assignment d. random / nonrandom
Two types of psychotherapy are compared for treating depression. A random half of the subjects receive each of the treatments. What type of design does this study represent?
a. Single-factor within-subjects b. Single-factor between subjects c. One-group pretest-posttest d. Posttest-only design with nonequivalent control groups
Current research suggests that Americans a. are getting just about the right amount of sleep
b. are sleeping more than the amount that is considered healthy. c. are sleeping less than the amount that is considered healthy. d. sleep too little during the work week, but maintain a healthy lifestyle by catching up on sleep over the weekend.