#1
Which of the following is a characteristic of a good experimental design?
Inclusion of only one variable
Exclusion of control group
Random assignment of subjects to groups
Using a small sample size
#2
What is the purpose of a control group in an experiment?
To compare the results of different experimental conditions
To provide a standard for comparison
To ensure that the experiment is conducted in a controlled environment
To manipulate the independent variable
#3
What is the term used to describe the extent to which a measurement tool accurately assesses the variable it is intended to measure?
Reliability
Validity
Precision
Accuracy
#4
What is the term used to describe the variable that is intentionally changed by the experimenter?
Dependent variable
Control variable
Independent variable
Confounding variable
#5
Which of the following is NOT a type of experimental design?
Between-subjects design
Within-subjects design
Quasi-experimental design
Cohort study design
#6
What is the difference between a cross-sectional and longitudinal study?
Cross-sectional studies observe subjects at multiple time points, while longitudinal studies observe subjects at a single time point.
Cross-sectional studies observe subjects from different age groups, while longitudinal studies observe subjects from the same age group.
Cross-sectional studies observe subjects at a single time point, while longitudinal studies observe subjects at multiple time points.
Cross-sectional studies involve manipulating variables, while longitudinal studies do not manipulate variables.
#7
What is the purpose of blinding in experimental design?
To prevent participants from knowing which treatment they are receiving
To prevent experimenters from knowing which treatment participants are receiving
To prevent bias in the interpretation of results
To ensure that all participants are treated equally
#8
What is a potential limitation of using convenience sampling in experimental research?
It may introduce selection bias
It ensures a representative sample
It is time-consuming
It requires a large sample size
#9
What is the term used to describe a variable that may unintentionally affect the outcome of an experiment?
Independent variable
Dependent variable
Confounding variable
Control variable
#10
What is the term used to describe the phenomenon where participants' behavior changes simply because they are aware of being observed?
Hawthorne effect
Observer bias
Confirmation bias
Demand characteristics
#11
Which of the following is an example of a quasi-experimental design?
Randomized controlled trial (RCT)
Pretest-posttest design with non-equivalent groups
Factorial design
Within-subjects design
#12
What is the term used to describe the phenomenon where participants' behavior is influenced by their belief about the purpose of the study?
Demand characteristics
Placebo effect
Experimenter bias
Double-blind procedure
#13
What is the primary purpose of a pilot study in experimental research?
To test the feasibility of the main study
To collect preliminary data for analysis
To ensure the validity of the results
To recruit participants for the main study
#14
Which of the following is NOT a type of probability sampling?
Simple random sampling
Stratified sampling
Convenience sampling
Systematic sampling
#15
Which of the following is a potential limitation of using a convenience sample in experimental research?
Limited generalizability
High cost
Low response rate
Difficulty in recruiting participants
#16
What is the purpose of randomization in experimental design?
To ensure that every participant has an equal chance of being assigned to any group
To eliminate the need for a control group
To increase the sample size
To control for confounding variables
#17
Which of the following is a potential disadvantage of using a pretest-posttest design?
Increased sensitivity to individual differences
Decreased ability to detect changes over time
Increased risk of history effects
Decreased internal validity
#18
In a factorial design, how are different levels of two or more independent variables combined?
By randomly assigning participants to different groups
By controlling for extraneous variables
By crossing each level of one variable with each level of another variable
By using a within-subjects design
#19
What is the term used to describe the extent to which the results of an experiment can be generalized to other populations, settings, and times?
External validity
Internal validity
Reliability
Validity
#20
Which of the following is a key advantage of using a randomized controlled trial (RCT) in experimental design?
High external validity
Low cost
Minimization of confounding variables
Quick implementation
#21
In a repeated measures design, what is the primary advantage of using the same subjects in each condition?
Reduced variability between subjects
Increased generalizability of results
Simplified data analysis
Decreased risk of experimenter bias
#22
What is the main advantage of using a matched pairs design in experimental research?
It requires a smaller sample size
It eliminates the need for randomization
It increases external validity
It controls for individual differences
#23
Which of the following is NOT a threat to internal validity in experimental research?
History
Maturation
Participant attrition
Regression to the mean
#24
What is the term used to describe the statistical technique used to control for the effects of extraneous variables in experimental research?
Analysis of variance (ANOVA)
Chi-square test
Multiple regression
Analysis of covariance (ANCOVA)
#25
What is the term used to describe the process of assigning participants to experimental conditions in such a way that each participant has an equal chance of being assigned to any condition?
Randomization
Matching
Counterbalancing
Stratification