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1. In an experiment, what is the independent variable?
The variable that is measured
The variable that is manipulated
The variable that remains constant
The variable that is observed
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2. What is a control group used for in experimental design?
To ensure the experiment is conducted in a controlled environment
To provide a baseline for comparison with the experimental group
To introduce variability into the experiment
To manipulate the independent variable
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3. What is the purpose of a placebo in a medical experiment?
To test the effectiveness of the experimental treatment
To deceive participants about the treatment they are receiving
To ensure blinding in the experiment
To manipulate the dependent variable
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7. In statistics, what is the purpose of random assignment in experiments?
To ensure that participants are randomly chosen for the study
To reduce bias and ensure groups are equivalent at the start of the experiment
To ensure that the researcher can control all variables
To guarantee that the treatment effect is significant
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8. What is the difference between correlation and causation?
Correlation implies causation
Causation implies correlation
Correlation is a statistical relationship, causation is a direct cause-and-effect relationship
There is no difference between them
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12. Why is it important to randomly assign participants to experimental conditions?
To ensure all participants have equal chances of being selected
To control for extraneous variables and increase the internal validity of the study
To match participants based on their characteristics
To increase the external validity of the study
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13. What is a covariate in experimental research?
A variable that is manipulated by the researcher
A variable that is measured but not of primary interest
A variable that is held constant throughout the experiment
A variable that is not considered in statistical analyses
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15. What is the purpose of a pilot study in experimental research?
To conduct the main experiment with a small sample size
To test the feasibility of the experimental procedures and identify potential issues
To manipulate the independent variable in a controlled setting
To collect data for the final analysis
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16. What is the purpose of blinding in a controlled experiment?
To prevent participants from dropping out of the study
To keep the researcher unaware of which participants are in the experimental or control group
To ensure participants are informed about the purpose of the study
To manipulate the independent variable
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4. What is the difference between a categorical and a numerical variable?
Categorical variables are qualitative, while numerical variables are quantitative
Categorical variables are continuous, while numerical variables are discrete
Categorical variables have numeric values, while numerical variables have labels
There is no difference between them
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5. What is a confounding variable in experimental research?
A variable that is intentionally introduced to confuse participants
A variable that is unrelated to the study but may affect the results
A variable that is always controlled in an experiment
A variable that is measured as the main outcome
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6. What is a factorial design in experimental research?
An experiment conducted in a factory
A design with multiple independent variables, each with multiple levels
An experimental design with only one independent variable
A design that factors out all extraneous variables
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9. In experimental design, what is the role of a counterbalanced design?
To balance the budget of the experiment
To ensure that each participant experiences all experimental conditions
To balance the distribution of participants in different experimental conditions
To balance the statistical power of the study
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10. What is the difference between a repeated measures design and an independent measures design?
Repeated measures involve the same participants in all conditions, while independent measures use different participants in each condition
Repeated measures use different participants in each condition, while independent measures involve the same participants in all conditions
There is no difference between them
Repeated measures design only considers categorical variables, while independent measures design only considers numerical variables
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11. What is a within-subjects factor in experimental design?
A variable that is constant across different participants
A variable that varies between different participants
A variable that is manipulated within the same participants across different conditions
A variable that is only considered in observational studies
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14. In a 2x2 factorial design, how many independent variables are there?
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17. What is the difference between a single-blind and a double-blind experiment?
In a single-blind experiment, only the participants are unaware of the treatment, while in a double-blind experiment, both participants and researchers are unaware.
In a double-blind experiment, only the participants are unaware of the treatment, while in a single-blind experiment, both participants and researchers are unaware.
There is no difference between them.
A single-blind experiment involves one group, while a double-blind experiment involves two groups.
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18. What is a Type I error in hypothesis testing?
Failing to reject a false null hypothesis
Rejecting a true null hypothesis
Correctly accepting a true null hypothesis
Correctly rejecting a false null hypothesis
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19. What is the purpose of a crossover design in experimental research?
To cross-reference different studies
To eliminate carryover effects by exposing each participant to all experimental conditions
To compare the results of two experiments
To manipulate the dependent variable
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20. In a repeated measures ANOVA, what does the F-ratio measure?
The variability between groups
The variability within groups
The overall variability in the data
The difference between the highest and lowest scores