A researcher notices that the participants assigned to the experimental group were less likely to attend the second session in his experiment than those in the control group
The researcher is concerned that __________ might represent a potential threat to the internal validity of her study.
a. history
b. attrition
c. instrumentation
d. maturation
b
You might also like to view...
When the doctor tells him that he is dying of cancer, Harley refuses to believe the doctor and insists that the laboratory results must be inaccurate. Harley is likely in the _____ stage of dying
a. denial b. anger c. bargaining d. depression
What was the purpose of the Human Genome Project?
A. to determine if genes are linked to human behaviors B. to identify all the genes in our chromosomes C. to determine the structure of DNA D. to find the mitochondria that contain genes
In category hierarchies, basic-level categories:
a. are highly descriptive but contain the least useful information b. are the category levels that children first learn to use c. are not very useful and contain only a few features d. provide a balance between the superordinate and intermediate levels
Which of the following is an inhibitory neurotransmitter that plays a role in mood, appetite, and sleep with a deficiency leading to depression?
a. dopamine b. acetylcholine c. serotonin d. glutamate