Question 1.
A group of researchers is replicating an earlier experiment that indicated that participants who received task-specific feedback were more likely to persist at a task than participants who received more general, encouraging feedback. In an effort to ensure that participants are not treated differently based on the condition that they are in, the researchers automate all of the procedures and follow a written protocol when interacting with the participants. The researchers are trying to minimize:
placebo effects.
demand characteristics.
experimenter expectancy effects.
participant suspicion effects.
Question 2.
In a study examining the effects of heredity on intelligence, researchers compare the correlation of intelligence test scores of identical twins with the correlation of intelligence test scores for fraternal twins. In this experiment, the researcher is assuming that the comparison of identical and fraternal twins is a measure of heredity. This is an example of a ________________ inference.
Question 3
Researchers interested in studying the effect of happiness on various health outcomes randomly assign each person who comes in to the laboratory to one of two study conditions. However, several people in the study are friends and drove to the study together. The group of friends indicates that they need to be in the same condition of the study so that they can all leave at the together to get home. Accommodating the subjects’ request might threaten validity because of the effect of:
regression to the mean.
Question 4
In an experiment on the effects of everyday stress on memory, a researcher has participants record every hour how much stress they are feeling and then complete a short-term memory task. The results of the study reveal that everyday stress may affect short-term memory. After evaluating the results of the study, however, the researcher is concerned that people who have high scores on neuroticism questionnaires are more likely to report stress and exhibit memory problems than people who have low scores. The researcher is worried about __________ validity.
statistical conclusion
Question 5
__________ validity concerns the generalizability of findings beyond the present study.
Statistical conclusion
Question 6
A researcher is investigating the ability of aversive punishment to decrease students’ disruptive behaviors in class. She is worried that the number of punishments will vary from student to student and thus will bias the results of the study. The researcher would do well to:
run a pilot test before conducting the study.
manipulate participants’ knowledge about the study.
use a yoked control-group.
use a red herring technique.
Question 7

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A psychologist is examining whether a new type of therapy is effective in the treatment of hallucinations and delusions. The psychologist administers a questionnaire to several patients with schizophrenia and selects those patients with the most severe psychotic symptoms. She randomly assigns the participants to the experimental condition in which they receive a new experimental drug, or the control condition in which they receive the standard medication. She then administers the same test of psychotic symptoms to assess delusional and hallucinations in the two groups at the end of the study. Which of the following threats are not ruled out in the above study?
regression to the mean
Question 8
A researcher is studying the effects of a new medication that promises to be extremely effective in the treatment of schizophrenia. She randomly assigns severely psychotic patients to three different conditions (standard medication; experimental medication; a wait-list control group) and measures delusional symptoms with the same questionnaire both before and after the study. The researcher uses a wait-list control group in order to:
ensure the ethical treatment of the patients.
rule out history effects.
decrease maturation effects.
rule out testing effects.
Question 9
A researcher found that whether or not a person is tired impacts how much soda one drinks. She also found that the effect of tiredness was magnified when the soda was cold (versus room temperature). Since the way tiredness impacted soda consumption was different based on the temperature of soda, the researcher reported that there was a(n):
dependent effect.
independent effect.
interaction effect.
multi-factor effect.
Question 10
A disordinal interaction is represented by lines that:
intersect and are parallel.
have similar slopes, but are not parallel.
intersect and are not parallel.
have opposite slopes and are parallel.
Question 11
In an experiment examining the effects of stress on decision making, researchers use two independent variables with two levels each. The first independent variable is temperature of the room (65 degrees and 95 degrees) and the second is noise in the room (present or absent). Researchers randomly assign participants to one of the two temperature conditions and then have the participants perform decision-making tasks in both conditions of the noise variable (present and absent). The researchers allow subjects to rest in between exposure to the noise variable and use counterbalancing of the noise conditions. This experiment uses a(n) _____ design, since subjects are randomly assigned to one independent variable, but exposed to all conditions of the second independent variable.
between-subjects factorial
within-subjects factorial
mixed-subjects factorial
Question 12
A researcher is looking at the effects of goal striving (i.e., low, medium, and high) and neuroticism (i.e., low, high) on achievement. The researcher is interested in examining the difference between high and low goal striving for high neuroticism individuals. The researcher is examining a(n):
three-way interaction.
simple contrast.
simple main effect.
two simple contrasts.
Question 13
Studies with factorial designs are better than students with single-factor designs at capturing the real-life complexity of the real world because they:
include mediator variables.
include more than one independent variables.
eliminate confounding variables.
include several control variables.
Question 14
Researchers conduct a study to understand whether pre-existing self-esteem and time of day impact how frequently a student raises her/his hand in class to answer a question. Results suggest that both self-esteem and time of day impact hand raising. Pre-existing self-esteem in this study is a(n) _____ variable.
selected independent
Question 15
A researcher is conducting an experiment on two predictors of conformity: group size and the presence of a defector (absent, present). The participants are randomly assigned to two different group sizes, one composed of 3 participants and one composed of 8 participants, and then participate in absent and present defector conditions. This is an example of a(n):
between-subjects factorial design with a within-subject variable.
mixed-factorial design.
within-subjects factorial design.
within-subjects factorial design with an experimentally manipulated variable.
Question 16
A psychologist who is investigating the effects of different levels of sweetness on fluid consumption would like to use the same participants in each condition. She is worried, however, that the order of the conditions may influence participants’ responses and decides to use the complete counterbalancing design. In earlier studies, she used 120 participants. In the current study, she would like to use 7 conditions and finds that the number of participants needed increases:
hardly at all.
not at all.
Question 17
If a researcher wanted to be sure that experimental groups were equivalent, the best method would be to use a _______________ design.
Question 18
In order to reduce the impact of differences in participant characteristics, a researcher ensures that each participant has an equal probability of assignment to any one of the conditions in the experiment. This is an example of:
random assignment.
researcher experience.
participant bias.
Question 19
A researcher wants to measure the effects of the presence of other people on performance. She has the same participants engage in both experimental conditions, so that each participant performs the task alone and in the presence of other people. This is an example of a study with a ______________ design.
Question 20
A researcher is investigating the impact of different levels of anxiety on the performance of a speech task. The researcher finds that at moderate levels of anxiety the students perform very well. However, at both lower and higher levels of anxiety, the students perform very poorly. This is an example of a _________________ effect.

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