#1
Which of the following is an example of an independent variable in an experiment?
Temperature
ExplanationIndependent variable is the variable manipulated or changed deliberately in an experiment.
#2
What is the dependent variable in an experiment?
The variable that is measured or observed
ExplanationDependent variable changes in response to the independent variable, being measured or observed.
#3
Which of the following is an example of a categorical variable?
Gender
ExplanationCategorical variable represents categories or groups, such as gender.
#4
What is a placebo in experimental design?
A treatment with no therapeutic effect, used as a control in experiments
ExplanationPlacebo is an inert substance or treatment used as a control to isolate the psychological effects of receiving a treatment.
#5
Which type of variable is typically plotted on the x-axis of a graph?
Independent variable
ExplanationIndependent variable, the manipulated factor, is usually plotted on the x-axis of a graph.
#6
In an experimental design, what is the purpose of a control group?
To provide a baseline for comparison
ExplanationControl group provides a standard for comparison, isolating the effect of the independent variable.
#7
What is the difference between a hypothesis and a prediction in experimental design?
A hypothesis is an educated guess, while a prediction is the expected outcome based on the hypothesis
ExplanationHypothesis is a proposed explanation for a phenomenon, while a prediction is what is expected to happen based on that explanation.
#8
What is a confounding variable in an experiment?
A variable that influences both the independent and dependent variables, making it difficult to determine their relationship
ExplanationConfounding variable is an extraneous factor that affects the relationship between the independent and dependent variables.
#9
In an experiment studying the effects of pesticides on crop yield, what would be an appropriate control group?
A group of crops not treated with any pesticide
ExplanationControl group in this context would be crops not exposed to the experimental treatment (pesticide).
#10
What is the difference between a cross-sectional study and a longitudinal study?
A cross-sectional study observes subjects at a single point in time, while a longitudinal study observes subjects over a long period of time.
ExplanationCross-sectional study collects data at a single time point, while longitudinal study tracks subjects over time.
#11
Which type of experimental design involves randomly assigning subjects to different treatment groups?
Experimental study
ExplanationExperimental study randomly assigns subjects to treatments to minimize bias and improve statistical validity.
#12
What is the difference between correlation and causation in experimental design?
Correlation indicates a statistical association, while causation implies a cause-and-effect relationship
ExplanationCorrelation suggests a relationship between variables, while causation indicates one variable directly affects the other.
#13
What is the purpose of randomization in experimental design?
To reduce the impact of confounding variables and distribute them evenly among treatment groups
ExplanationRandomization minimizes bias by ensuring equal distribution of potential confounding variables among treatment groups.
#14
In a double-blind study, who is unaware of which treatment each subject is receiving?
Both the experimenter and the subjects
ExplanationBoth the researchers and the participants are unaware of who is receiving the treatment, ensuring objectivity.
#15
What is the difference between random sampling and random assignment in experimental design?
Random sampling ensures that all subjects have an equal chance of being selected, while random assignment ensures that all subjects have an equal chance of being assigned to treatment groups.
ExplanationRandom sampling involves selecting subjects from a population randomly, while random assignment involves randomly allocating subjects to different groups.