What is the purpose of a pilot study in experimental research?
To test the equipment
To train participants
To refine the research procedures
To collect data for analysis
#2
What is the term for a researcher's unintentional influence on the results of a study?
Demand characteristic
Hawthorne effect
Experimenter bias
Placebo effect
#3
What is the purpose of a control group in experimental research?
To provide a comparison for the experimental group
To manipulate the independent variable
To ensure that participants are unaware of the experimental conditions
To measure the dependent variable
#4
Which of the following is NOT a type of experimental design?
Between-subjects design
Within-subjects design
Correlational design
Mixed design
#5
Which of the following is NOT a potential threat to internal validity in an experimental design?
History
Maturation
Regression to the mean
Selection
#6
In a within-subjects design, each participant experiences:
Only one level of the independent variable
All levels of the independent variable
Different dependent variables
Different research questions
#7
Which type of validity is concerned with the degree to which results can be generalized to other populations or settings?
Internal validity
External validity
Construct validity
Content validity
#8
Which of the following is an example of a demand characteristic?
Participant's age
Experimental manipulation
Experimenter's bias
Participant's suspicion about the study's purpose
#9
A researcher wants to study the effect of caffeine on memory. She randomly assigns participants to either a caffeine or placebo condition and measures their memory performance. What is the independent variable in this study?
Memory performance
Caffeine
Placebo
Random assignment
#10
Which of the following is a potential disadvantage of using a convenience sample?
It ensures high external validity
It may introduce sampling bias
It requires less time and resources
It allows for random assignment
#11
Which of the following is NOT a characteristic of a true experiment?
Random assignment
Control group
Manipulation of independent variable
Naturalistic observation
#12
In a counterbalanced design, what is the purpose of counterbalancing?
To ensure that participants are balanced in terms of gender
To prevent order effects in repeated measures designs
To counteract the effects of random assignment
To ensure that participants have equal knowledge about the experimental manipulation