What is the history threat in a single group design?
What will be an ideal response?
When some event other than your program occurs at the same time and affects the outcome, we say there is a history threat to internal validity. It's not your program that caused the outcome; it's something else, some other event that occurred between the pretest and the posttest. We refer to this other event as an "historical" one, because it is something that happens during the course of your study; it, like your program, is an event in history, so to speak.
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The law of specific nerve energies states that ____
a. perception of a repeated stimulus fades b. every stimulation of the optic nerve is perceived as light c. the speed of action potentials varies depending on the strength of the stimulus d. any stimulation above the threshold produces an action potential
If there were no new candidates for organs, it would take approximately four years to eliminate the backlog of candidates waiting for organs in the United States
Indicate whether the statement is true or false
Which approach to dreaming suggests that our dreams are simply a modification of the thinking that goes on when we are awake?
a. the problem-focused approach b. the psychoanalytic approach c. the cognitive approach d. the activation-synthesis approach
Drugs such as LSD affect the activity of __________ -secreting neurons permitting
__________. a. serotonin; hallucinations to occur b. dopamine; a deep feeling of euphoria c. acetylcholine; a reduced sensitivity to pain to develop d. dopamine; symptoms of schizophrenia to develop e. GABA; depressive feelings to occur